Computer will not boot. It is a T2682 e Machine with XP home. Computer was working fine the last time used. No new hardware or software has been added for some time. When I turn it on, I only get a loud rapid ticking sound and the power light and hard drive read write light blinks in sync with the ticking sound. I have to turn off the power supply to shut it off. I noticed that the CPU fan was not working, and tested it on another computer and it worked fine. I tried a different power supply, replaced the keyboard and mouse, disconnected all drives, stripped the motherboard, same result. I only have one memory chip of this type (pc2100) and no other computer in which to check it. I have heard this ticking sound in the past, some years ago, but cannot remember the cause.
Guido