Last night I moved my old Dell 2400's innards into a new larger case. The computer booted immediately (XP SP2) and ran fine, no problems at all, for several hours.
This morning when I started it up, I noticed it was running slow. I checked the Task Manager and I was at 100% CPU usage, with most of it going to the System process (not System Idle).
I tried shutting down a few other larger programs with no change. I rebooted, and found that I was at 100% CPU even before the usual startup items opened. It stays at 100% constantly and is slowing everything down.
I ran Spysweeper last night, I know the virus/spyware situation is fine on this machine. Can someone tell me how to start fixing this problem? Could I have damaged something moving it from the old case - but it was fine last night...