I have a HP Premium Photosmart C309a printer. It is setup for wireless printing, however, lately when I try to print anything, it doesn't print & I get an error message on my computer (I have Windows Vista). When I go to the printer, the screen is dark and it seems to be frozen. I can't turn it off nor will any of the buttons work (OK button, Home button, etc). The only way to get it to work is by unplugging it which defeats the purpose of having a wireless printer.
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