Hi, I have a problem with unexpected shutting down of my computer. I'm running XP Pro with 4 gig of ram and plenty of free HDD space. 2009 version of Nortons Internet security, the latest patches and updates from Windows and Nortons. So far I have tried the following:- 1. cleaned internally of dust 2. removed and reseated all cards 3. checked all computer cabling..unplugged and re-plugged. 4. removed RAM and reseated 5. replaced CPU fan 6. replaced power supply 7. run REGCURE 7. re-installed Windows XP Pro full clean install. 8. installed UPS 9. opened case and set up external fan for extra cooling. 10. replaced HDD 11. last resort....considered suicide. After all the above, the system still shuts down for no reason. Sometimes it will restart after I switch back on... other times I must wait an hour or so... You'd save my life if someone could please help.... Many thanks.... Very best regards, Desperate Debbie. silvercoyotemail@bigpond.com

Something that should have been done first, is to check the temperatures. That can usually be done in the bios setup routine, or with a motherboard monitoring program, like Speedfan. I suspect that the CPU might be overheating.

what errors are you getting when it shuts down? Post the exact errors and that will help. Some HELP in posting on Computing.net plus free progs and instructions Cheers