HP ScanJet 5100c - Unlocked & STILL grinding

My HP 5100c scanner has always been unlocked from the day I installed it.  Since then I have purchassed a new PC with Win98 on it and installed and updated ALL the Win98 drivers available from HPs website (except the scan-to-web program, which I do not use).  The scanner started from the normal position at the TOP of the page and moved down the sheet to copy and print the page.  What came out of the printer was a solid black page and now the scanner's optical head is at the bottom of the sheet and staying there!  It never returned to its start position!  Is this a driver problem or has the scanner failed and does it need to be replaced???  Norton Antivirus was disabled all through the install process and other software/hardware has been installed fine, so I am concerned that all of a sudden, after getting a Win98 machine, that the scanner has stopped working properly and now is grinding the motor every time I try to scan or test it!  Please advise...

Dan

PS- I would like to be refunded my 10 points for the "Unlock the scanner" solution already posted for this kind of problem as it was already available FREE on HP's website, we have already checked that anyway, and the solution was not useful to me.  The description of the problem and solution was really too vague for me to determine if it was what I was looking for or not.