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This series of HP all-in-one units have a common problem that, over time, the exposure lamp. which is florescent, goes dim. The scanner looks for the right amount of light, and if it doesn't see it, it gives you the scanner failure. In some rare cases, you can dismantle and clean the mirrors and lens in the scanner, but most of the time it doesn't work. There are no parts available for this unit.
I have seen other HP scanner/printers with very similar problems in our shop. On many of them it is caused by dirty scanner glass or dirty mirrors. We have a tech page with step by step cleaning that should help you. You can find it at www.ccl-la.com I hope this helps, if so please rate our solution.
Buddy Corporate Computer www.ccl-la.com Over 21 years of PC and printer support/repair
The only thing I can surgest is that you check installed programs I found that the 750 is very fussy about being the only kid on the block. Maybe worth trying a commercial program that says it will remove "junk" from your hard drive