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Did you tried USBCHK.exe on the CD that comes with the scanner?
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Did you tried USBCHK.exe on the CD that comes with the scanner?

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What I found through further research on my own is that the VIA chips on the Digital Research USB card that I had purchased were the culprit. &nbsp;A note buried on DR's website indicated that HP had indicated that the VIA USB chips were not compatible with HP Scanners. &nbsp;I sure wish that HP's own documentation was more direct with this info.
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What I found through further research on my own is that the VIA chips on the Digital Research USB card that I had purchased were the culprit.  A note buried on DR's website indicated that HP had indicated that the VIA USB chips were not compatible with HP Scanners.  I sure wish that HP's own documentation was more direct with this info.

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What USB chipsets are supported by HP ScanJet scanners?
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What USB chipsets are supported by HP ScanJet scanners?

Supported USB Chipsets

A peripheral device is defined as a computer device, such as a keyboard or printer, that is not part of the essential computer (i.e., the memory and microprocessor). These auxiliary devices are intended to be connected to the computer and used in conjunction with it. Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner, while internal peripherals include CD-ROM drive, CD-R drive or internal modem. Today's new devices, such as tablets, smartphones and wearable computing devices are considered peripherals as they can be connected and used on a computer system. The difference, however, is that these devices can run independently of the computer system.