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title: UntitledWhy My HP OfficeJet Pro 7740 Cartridge Is Not Communicating (Complete Fix Guide)

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# Why My HP OfficeJet Pro 7740 Cartridge Is Not Communicating (Complete Fix Guide)
<p><span style="font-weight: 400;">When an </span><a href="http://linkedin.com/pulse/hp-officejet-pro-7740-cartridge-problem-fix-complete-guide-smith-rzjnc"><strong>HP OfficeJet Pro 7740 cartridge not communicating</strong></a><span style="font-weight: 400;"> message appears, printing stops immediately&mdash;often at the worst possible time. This issue is common across HP inkjet models, but the </span><a href="http://linkedin.com/pulse/hp-officejet-pro-7740-cartridge-problem-fix-complete-guide-smith-rzjnc"><strong>OfficeJet Pro 7740</strong></a><span style="font-weight: 400;"> is especially sensitive to contact errors, firmware conflicts, chip recognition failures, and installation problems.</span></p>
<p><span style="font-weight: 400;">In this guide, we cover </span><strong>every proven fix</strong><span style="font-weight: 400;"> for the </span><a href="http://linkedin.com/pulse/hp-officejet-pro-7740-cartridge-problem-fix-complete-guide-smith-rzjnc"><strong>HP 7740 cartridge communication error</strong></a><span style="font-weight: 400;">, including the exact steps to restore ink detection and eliminate recurring warnings.</span></p>
<p><strong>What &ldquo;Cartridge Not Communicating&rdquo; Means on HP OfficeJet Pro 7740</strong></p>
<p><span style="font-weight: 400;">The </span><strong>cartridge not communicating</strong><span style="font-weight: 400;"> error typically means the printer cannot properly read the cartridge&rsquo;s electronic data. The printer relies on a small </span><strong>cartridge chip</strong><span style="font-weight: 400;"> and a set of </span><strong>gold electrical contacts</strong><span style="font-weight: 400;"> to verify:</span></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge is installed correctly</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge type is supported</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge has a readable chip</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge is not blocked by contact contamination</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge firmware is compatible with the printer firmware</span></li>
</ul>
<p><span style="font-weight: 400;">If any of these checks fail, the </span><a href="http://linkedin.com/pulse/hp-officejet-pro-7740-cartridge-problem-fix-complete-guide-smith-rzjnc"><strong>HP OfficeJet Pro 7740</strong></a><span style="font-weight: 400;"> may show messages like:</span></p>
<ul>
<li style="font-weight: 400;"><strong>&ldquo;Cartridge cannot be used until printer is enrolled in HP Instant Ink&rdquo;</strong></li>
<li style="font-weight: 400;"><strong>&ldquo;Cartridge problem&rdquo;</strong></li>
<li style="font-weight: 400;"><strong>&ldquo;One or more cartridges are missing or damaged&rdquo;</strong></li>
<li style="font-weight: 400;"><strong>&ldquo;Cartridge not communicating&rdquo;</strong></li>
<li style="font-weight: 400;"><strong>&ldquo;Incompatible cartridge&rdquo;</strong></li>
</ul>
<p><strong>Most Common Causes of </strong><a href="http://linkedin.com/pulse/hp-officejet-pro-7740-cartridge-problem-fix-complete-guide-smith-rzjnc"><strong>HP 7740 Cartridge Communication Failure</strong></a></p>
<p><span style="font-weight: 400;">Before fixing the issue, it helps to identify the likely cause. The most frequent reasons include:</span></p>
<p><strong>1) Dirty or Oxidized Cartridge Contacts</strong></p>
<p><span style="font-weight: 400;">Ink mist, dust, and oxidation can block the cartridge chip from making a clean connection.</span></p>
<p><strong>2) Protective Tape Still on the Cartridge</strong></p>
<p><span style="font-weight: 400;">If the orange pull-tab or plastic seal is still attached, the cartridge may physically install but fail electronically.</span></p>
<p><strong>3) Improper Cartridge Seating</strong></p>
<p><span style="font-weight: 400;">Even slightly misaligned cartridges can trigger communication errors.</span></p>
<p><strong>4) Firmware Update Conflict</strong></p>
<p><span style="font-weight: 400;">HP firmware updates can sometimes interfere with </span><strong>third-party cartridges</strong><span style="font-weight: 400;"> or older chip versions.</span></p>
<p><strong>5) Defective Cartridge Chip</strong></p>
<p><span style="font-weight: 400;">A damaged or low-quality cartridge chip can fail intermittently or completely.</span></p>
<p><strong>6) Printer Contact Pins Not Touching</strong></p>
<p><span style="font-weight: 400;">Inside the carriage are small spring-loaded contact pins. If they are stuck or bent, communication fails.</span></p>
<p><strong>Step-by-Step Fix: HP OfficeJet Pro 7740 Cartridge Not Communicating</strong></p>
<p><span style="font-weight: 400;">Follow these steps in order. Each one eliminates a specific failure point.</span></p>
<p><strong>1) Perform a Proper Power Reset (Most Effective First Fix)</strong></p>
<p><span style="font-weight: 400;">A standard restart is often not enough. We need a full reset to clear the printer&rsquo;s internal state.</span></p>
<p><strong>Power Reset Instructions</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Keep the printer </span><strong>ON</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Unplug the </span><strong>power cord from the back</strong><span style="font-weight: 400;"> of the printer</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Unplug the power cord from the wall outlet</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Wait </span><strong>60 seconds</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Plug the cord back into the wall outlet</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Plug the cord back into the printer</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Turn the printer back ON if it does not power on automatically</span></li>
</ol>
<p><span style="font-weight: 400;">This reset clears cached cartridge status and restores proper cartridge polling.</span></p>
<p><strong>2) Remove and Reinstall the Cartridges Correctly</strong></p>
<p><span style="font-weight: 400;">Improper installation is a leading cause of communication errors.</span></p>
<p><strong>Correct Reinstallation Steps</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Open the cartridge access door</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Wait for the carriage to stop moving</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Remove all cartridges</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Inspect each cartridge for:</span></li>
<ul>
<li style="font-weight: 400;"><strong>Orange protective tape</strong></li>
<li style="font-weight: 400;"><strong>Plastic sealing strips</strong></li>
<li style="font-weight: 400;"><strong>Ink residue on the chip</strong></li>
</ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Reinsert each cartridge firmly until it clicks</span></li>
</ol>
<p><strong>Important:</strong><span style="font-weight: 400;"> Insert cartridges into the correct slots (black into black, colors into color slots). Even one incorrect placement can trigger a system-wide communication failure.</span></p>
<p><strong>3) Clean the Cartridge Chip and Printer Contacts (Critical Fix)</strong></p>
<p><span style="font-weight: 400;">If the </span><strong>HP OfficeJet Pro 7740 cartridge not communicating</strong><span style="font-weight: 400;"> issue persists, cleaning the electrical contacts is essential.</span></p>
<p><strong>What You Need</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Lint-free cloth or coffee filter</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Distilled water or 90%+ isopropyl alcohol</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Dry cotton swabs (optional)</span></li>
</ul>
<p><strong>How to Clean the Cartridge Contacts</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Remove the cartridge</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Locate the </span><strong>gold-colored contact area</strong><span style="font-weight: 400;"> on the cartridge</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Lightly dampen the cloth (do not soak)</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Wipe the contacts in one direction</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Allow the cartridge to dry for </span><strong>5 minutes</strong></li>
</ol>
<p><strong>How to Clean the Printer Contacts</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">With cartridges removed, locate the </span><strong>matching contact pads</strong><span style="font-weight: 400;"> inside the carriage</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Use a lightly dampened cloth or swab</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Gently wipe the contact area</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Let it dry fully before reinstalling cartridges</span></li>
</ol>
<p><strong>Do not scrape</strong><span style="font-weight: 400;"> contacts with sharp objects&mdash;this can permanently damage the conductive layer.</span></p>
<p><strong>4) Test One Cartridge at a Time to Identify the Faulty One</strong></p>
<p><span style="font-weight: 400;">If one cartridge is failing, it can cause the printer to reject all cartridges.</span></p>
<p><strong>Isolation Test Method</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Remove all cartridges</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Insert </span><strong>only the black cartridge</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Close the door and check for errors</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">If no error appears, remove black and insert </span><strong>one color cartridge</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Repeat for each cartridge</span></li>
</ol>
<p><span style="font-weight: 400;">This identifies whether the problem is:</span></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">A </span><strong>single defective cartridge</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">A </span><strong>specific color slot</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">A </span><strong>carriage contact issue</strong></li>
</ul>
<p><span style="font-weight: 400;">If the error occurs only when a certain cartridge is installed, that cartridge is the likely culprit.</span></p>
<p><strong>5) Confirm You&rsquo;re Using the Correct Cartridge Model for HP 7740</strong></p>
<p><span style="font-weight: 400;">The </span><strong>HP OfficeJet Pro 7740</strong><span style="font-weight: 400;"> uses specific cartridge series depending on region.</span></p>
<p><span style="font-weight: 400;">Common compatible types include:</span></p>
<ul>
<li style="font-weight: 400;"><strong>HP 952 / 952XL</strong><span style="font-weight: 400;"> (most common)</span></li>
<li style="font-weight: 400;"><strong>HP 953 / 953XL</strong><span style="font-weight: 400;"> (certain regions)</span></li>
</ul>
<p><span style="font-weight: 400;">If the cartridge number doesn&rsquo;t match what the printer expects, communication can fail immediately.</span></p>
<p><strong>Where to Verify</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Printer manual</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Sticker inside the cartridge access area</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Printer screen cartridge details menu</span></li>
</ul>
<p><span style="font-weight: 400;">Using the wrong series is a guaranteed communication error.</span></p>
<p><strong>6) Disable Instant Ink Restrictions (If Applicable)</strong></p>
<p><span style="font-weight: 400;">If the printer is enrolled in </span><strong>HP Instant Ink</strong><span style="font-weight: 400;">, non-Instant Ink cartridges may trigger errors.</span></p>
<p><strong>Signs Instant Ink Is the Issue</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Message mentions </span><strong>Instant Ink</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Cartridge worked previously but stopped after enrollment changes</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Printer rejects standard retail cartridges</span></li>
</ul>
<p><strong>What We Can Do</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Use official </span><strong>Instant Ink cartridges</strong><span style="font-weight: 400;"> if enrolled</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Remove the printer from Instant Ink (if allowed) and restart</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Confirm subscription status is active and not suspended</span></li>
</ul>
<p><span style="font-weight: 400;">Instant Ink systems are designed to verify cartridges online and may block others.</span></p>
<p><strong>7) Update Printer Firmware the Right Way (Or Roll Back Strategy)</strong></p>
<p><span style="font-weight: 400;">Firmware is a common reason the HP 7740 stops communicating with cartridges, especially with non-HP ink.</span></p>
<p><strong>Recommended Firmware Update Approach</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Use the printer&rsquo;s control panel to check for updates</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Or update through the official HP software installed on the computer</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Restart the printer after the update completes</span></li>
</ul>
<p><strong>When Firmware Makes It Worse</strong></p>
<p><span style="font-weight: 400;">If the error started </span><strong>immediately after an update</strong><span style="font-weight: 400;">, the update may have introduced stricter cartridge verification.</span></p>
<p><span style="font-weight: 400;">In that case, the practical fix is:</span></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Try a </span><strong>newer chip revision cartridge</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Switch to </span><strong>genuine HP cartridges</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Replace the problematic cartridge with a higher-quality compatible version</span></li>
</ul>
<p><strong>8) Reset the Printing System (Windows and macOS Fix)</strong></p>
<p><span style="font-weight: 400;">Sometimes the printer is fine, but the computer&rsquo;s print system is corrupted.</span></p>
<p><strong>Windows Print System Reset</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Open </span><strong>Control Panel</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Go to </span><strong>Devices and Printers</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Remove the HP OfficeJet Pro 7740</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Restart the computer</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Reinstall the printer using HP software</span></li>
</ol>
<p><strong>macOS Printing System Reset</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Open </span><strong>System Settings &rarr; Printers &amp; Scanners</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Right-click in the printers list</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Select </span><strong>Reset printing system</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Add the printer again</span></li>
</ol>
<p><span style="font-weight: 400;">This can resolve false cartridge errors triggered by driver-level miscommunication.</span></p>
<p><strong>9) Inspect the Cartridge Carriage for Mechanical Contact Problems</strong></p>
<p><span style="font-weight: 400;">If cleaning doesn&rsquo;t work and multiple cartridges fail, the carriage may not be making proper contact.</span></p>
<p><strong>What to Look For</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Ink buildup around the carriage contacts</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Bent or stuck </span><strong>spring pins</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Carriage not locking properly into position</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Excessive resistance when inserting cartridges</span></li>
</ul>
<p><span style="font-weight: 400;">If pins are stuck, gentle cleaning may help. If pins are bent or broken, the printer may require service.</span></p>
<p><strong>10) Fix &ldquo;Cartridge Not Communicating&rdquo; After Refill or Third-Party Ink</strong></p>
<p><span style="font-weight: 400;">Third-party cartridges and refills are a major trigger for this problem because the printer relies heavily on chip authentication.</span></p>
<p><strong>Best Practices for Compatible Cartridges</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Use a cartridge labeled specifically for </span><strong>HP OfficeJet Pro 7740</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Avoid very old stock cartridges (chip versions can be outdated)</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Replace any cartridge showing:</span></li>
<ul>
<li style="font-weight: 400;"><strong>chip scratches</strong></li>
<li style="font-weight: 400;"><strong>misaligned label</strong></li>
<li style="font-weight: 400;"><strong>ink leakage</strong></li>
<li style="font-weight: 400;"><strong>warped plastic housing</strong></li>
</ul>
</ul>
<p><span style="font-weight: 400;">A cartridge can look normal but still fail at the chip level.</span></p>
<p><strong>11) Perform a Hard Reset (Advanced Recovery Step)</strong></p>
<p><span style="font-weight: 400;">If the issue persists after cleaning and reseating, a deeper reset may help.</span></p>
<p><strong>Hard Reset Method</strong></p>
<ol>
<li style="font-weight: 400;"><span style="font-weight: 400;">Turn the printer on</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Disconnect the power cable from the printer while it is on</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Hold the </span><strong>Power button</strong><span style="font-weight: 400;"> for </span><strong>15 seconds</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Reconnect the power cable</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Turn the printer on and reinstall cartridges</span></li>
</ol>
<p><span style="font-weight: 400;">This clears deeper cartridge handshake states and can restore detection.</span></p>
<p><strong>12) Replace the Cartridge If It Fails These Tests</strong></p>
<p><span style="font-weight: 400;">At a certain point, the cartridge itself is the problem.</span></p>
<p><strong>Replace the Cartridge If:</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">The same cartridge fails in multiple slots</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The printer accepts other cartridges except one</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge chip looks scratched or discolored</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Cleaning and reseating make no difference</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">The cartridge is brand new but shows communication errors repeatedly</span></li>
</ul>
<p><span style="font-weight: 400;">If replacing, choose:</span></p>
<ul>
<li style="font-weight: 400;"><strong>Genuine HP 952/952XL</strong><span style="font-weight: 400;"> (best reliability)</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">A </span><strong>high-quality compatible cartridge</strong><span style="font-weight: 400;"> with updated chip support</span></li>
</ul>
<p><strong>Quick Checklist: HP OfficeJet Pro 7740 Cartridge Not Communicating Fix Summary</strong></p>
<p><span style="font-weight: 400;">Use this checklist to fix the problem quickly:</span></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Perform a </span><strong>60-second power reset</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Remove and reinstall cartridges correctly</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Remove all protective tape and seals</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Clean </span><strong>gold contacts</strong><span style="font-weight: 400;"> on cartridges and carriage</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Test cartridges </span><strong>one at a time</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Confirm correct cartridge model (</span><strong>952/952XL</strong><span style="font-weight: 400;">)</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Check Instant Ink enrollment restrictions</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Update printer firmware properly</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Reset Windows/macOS printing system</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">✅</span><span style="font-weight: 400;"> Replace the defective cartridge if isolated</span></li>
</ul>
<p><strong>How to Prevent Cartridge Communication Errors in the Future</strong></p>
<p><span style="font-weight: 400;">Once the printer is working again, prevention matters.</span></p>
<p><strong>Best Prevention Tips</strong></p>
<ul>
<li style="font-weight: 400;"><span style="font-weight: 400;">Store cartridges in a cool, dry place</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Avoid touching the </span><strong>gold contacts</strong></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Install cartridges immediately after unsealing</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Clean contacts every few months if printing frequently</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Avoid mixing very old cartridges with brand new ones</span></li>
<li style="font-weight: 400;"><span style="font-weight: 400;">Keep firmware stable if using compatible ink</span></li>
</ul>
<p><span style="font-weight: 400;">Consistent maintenance reduces recurring cartridge handshake failures.</span></p>
<p><strong>Final Word: Restore Printing Fast on HP OfficeJet Pro 7740</strong></p>
<p><span style="font-weight: 400;">When the </span><a href="http://linkedin.com/pulse/hp-officejet-pro-7740-cartridge-problem-fix-complete-guide-smith-rzjnc"><strong>HP OfficeJet Pro 7740 cartridge not communicating error</strong></a> <span style="font-weight: 400;">appears, it is almost always caused by </span><strong>dirty contacts, incorrect seating, incompatible cartridges, firmware conflicts, or a failing cartridge chip</strong><span style="font-weight: 400;">. By following the step-by-step fixes above, we can restore proper cartridge detection, eliminate repeated errors, and get back to reliable printing without unnecessary replacements.</span></p>
