If HP Deskjet 3755 ink cartridges are not recognized, try these steps: Ensure cartridges are correctly installed and fully seated. Clean cartridge and printer electrical contacts with a lint-free cloth. Restart the printer and wait for it to initialize. Update printer firmware and software through the HP website. Replace cartridges with genuine HP ink if using third-party ones. Perform a power reset by unplugging the printer for one minute. Check for any protective tape on cartridge contacts and remove if present.
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