I was recently faced with this same problem, with non detection of the scanner N640P ex flatbed. It has a card for the parallel port connection and was installed by a computer repairer to save me time. He said it worked, but when I got it home, it failed, even with the new driver added.
Here is what I did.
Check the ports in which are used for the scanner, mine was found to be LPT2, I changed that to LPT1.
(Be prepared to reverse these 2 if necessary).
I did a reboot and turned on the scanner and it showed it was there but refused to bring up the Toolbox to scan anything.
Next step, go the Microsoft and pick up this "Restore parVdm" this belongs in Windows System 32 and aids in the recognition of not only your scanner but other vital peripherals.
Its a microsoft fail when the parVdm does not recognise something.
I installed that as it comes down in .rar file, and rebooted, and all is working exceptionally well.
Will this work with any other OS? I have no idea. This worked for me on XP SP3 but parVdm also exists in Windows
7,
8 and
Vista.
ParVdm Windows XP Service batcmd com
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