mouse not working

["Chiu, PCM (Peter) " <P C M Chiu rl ac uk>]

I have an odd problem.  The PS/2 mouse does not work any more on the FC2
box.

I tried the mouseconfig, reset it, and exit, no avail.

The box is multi-booting, I boot up RH EL 3, the mouse works okay.

I even tried to rebuild the system from scratch using installation CD, but
no good neither.
In fact, I have noticed the mouse didn't work even during the installation
process.

The messages file does not show much info, just said:
IMPS2: auto-detected intelligent mouse.

I plugged in a different mouse, still no good.

Anyone has any idea where else to look?