The print carriage cannot move HP Officejet Pro 6978

[L1sa_As1l]

Hi all - 

I'm receiving the following error message:

"The print carriage cannot move. Open the cartridge access door, clear any paper jam or obstruction, and select OK."

Which, of course, I tried. There is nothing in the way of the carriage, and I can manually move the carriage across the track when the printer is on. However, no matter how many times I restart the printer, attempt to clear any "obstructions" (of which there are none), re-insert the ink cartridges, and change power outlets, the error message remains the same. 

Please help! I received this printer "brand new" (oh bother) for $25 at a garage sale, and it looks to be in perfect condition, save this one major setback.

[Betty0610]

@L1sa_As1l

Welcome to the HP Support Community.

Have you tried all the steps from here? https://support.hp.com/us-en/product/hp-officejet-pro-6970-all-in-one-printer-series/8289585/model/1... and https://support.hp.com/us-en/product/hp-officejet-pro-6970-all-in-one-printer-series/8289585/model/1...

Try connecting the Printer to a different wall outlet directly.

Let me know if this helps.

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Thanks!

Have a great day!