The title says it; here my analysis so far:
I installed SP2 within the week before I shut it down and it did started this behavior. (The PC runs almost round the clock) Basically it boots up everythings normal it gets the the windows XP screen with the little progress bar then it shows the cursor. This is the buggy part. I press the OSD and no resolution is shown or set. The cursor is the only thing shown and works, but a few seconds later it reboots. Once in a while ill get an error talking about Not enough virtual memory or qouta. <-something similar to that and again reboot.
Drink was spilled on the USB keyboard.
After thorough wash and air dry, i plugged keyboard back in and keyboard still did not work, though the caplock lights came on.
Popped open the key matrix and found charred wires all over it.
Got a new keyboard plugged it in, and worked just fine but still cant get to the login screen.
Ive tried chkdsk and used recovery console as well as used XPs Repair setup.
Compaq restore doesnt boot.
I followed MS procedure for deleting Pagefile.sys but still get same reboots.
I beleive SP2 could be the problem but unfortuantanly i couldnot find the $ntservicepackuninstall$ in the root directory, using recovery console and folllowing MS directions. I never fully had SP2 on the system but i beleive the install was completed but the system needed a restart which i denied. I did find a lot of the ntuninstall folders but most seem to be XP hotfixes.