Are you using new ink cartridges or manufactured ones? If the device in not recognizing the new ink, Try deleting it in the printers file and reinstall it. if this doesn't work uninstall the software shut down the system and restart, then reinstall the software. Many units don't see recognize cartridges that have been refilled.
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A lot of printer manufactures place a small chip on the ink cartridge. Combined with the printer software it knows you re-filled the cartridge. This forces you to buy new ink. A work around that works with some printers. Keep you're old ink cartridges. Replace with new and when it empties replace with you're re-filled ink cartridge. Store you're old re-filled cartridges in a dry cool place when not in use. With HP printers users keep three cartridges.
Clean encoder strip, thin plastic strip runs width of machine pararell to silver scan rail. Ensure it is running threw carriage smoothly otherwise the light that read it is dodgy, this will be unecomical to fix unless dirty strip
This printer uses PG-30 and Cl-31 ink tanks. You can also use PG-40 and CL41. Open paper output tray. Turn on the machine and lift up the scanning unit or printer cover. Pull unit support down into place and the ink holder will move to the left. Gently remove cartridges and install new ones. Let me know of outcome.