HP 5100c unresponsive

Hello

My scanjet5100c scanner is not working. I have never had a problem with
it under win98 but recently it has stopped working. When you switch the
scanner on the green power light comes on and there is a flash from the
tray but that is it, the engine nor the mechanism do not move. I have
installed this scanner on a different win98 machine and have the same
problem. I am sure it is not a software issue. Has anyone got an idea as
to what this problem may be.

TIA
Pete