Thanks for posting this question. I never imagined I'd be answering HP questions here but I am glad to do so. I served for 15 years at HP as a Tier 1, Tier 2 and Tier 3 Technician, with a specialty in Inkjet Printers (1999-2014). Basically, I'm an HP Printer Subject Matter Expert.
Frankly, I wish I had better news for you. It's time to replace your printer. If you have already turned it off and on, removed the power overnight and tried turning it on again, its likely that the printhead itself within the printer has failed - electrically.
Unfortunately HP doesn't design their consumer printers with repairability in mind.
Sorry to be the bearer of bad news,