HP Print & Scan Doctor 5.3 says "...front door/cover is open or toner cartridge is missing..." It's got paper, toner cartridge (LD - offbrand from Amazon), power, and a green light... Printed fine until 2 weeks ago... I've removed/reinserted toner cartridge, opened & closed the lid, power off & on, all several times, same message... All green lights on the "Doctor", but won't print test page... Suggestions???
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