I have had this very problem with 2 of these scanners (8920) and finally figured out what happens is that the cheap chinese power supply loses power over time and then finally gives out. Before it fully gives out it doesn't have enough power to scan properly but will still turn the scanner on. Symptoms range from terrible scans with noise to the dreaded "scanner is locked" error. I got a new power supply from radioshack - 12 VDC at 1.5A (1500 MA) and it works like brand new! Make sure the power supply can deliver the full 1.5 A of the original! This is very important.
Get another scanner. Check whether the lock has not been enabled at the bottom of the scanner. This has happened with me as well and a known Visioneer problem.
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