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Same thing just happened to my fairly new 7520 Hp.
I shut my machine first with the shut off button and then unplugged
it for about 5 minutes. Sounds like you tried this and I believe this did not work for me either so I just went into the HP official site and downloaded my printer again. Downloading your printer from their
site is easy and quick instead using the cd. It automatically removed my old printer and installed the printer again. The problem has not returned.
Another problem I just had and because I think one of my new
cartridges (yellow) is somehow damaged. I got a black line down
my pages with a note that my yellow ink is missing. Had black line only when printing and not copying. I reinserted the yellow ink and took a light damp qtip and slightly wiped the machine screen on each ink cartridge.(this screen meets the new opening from each
new cartridge. The black line left.