Redout said:virus? memory leakage? old drivers?
lots of things can be the source of the reboot.
you should tell us all your computer specs and run a virus scan - AVG and ad-aware are free softwares you can download and check.
stir-fry said:check your event viewer right after it happens to see if it's being caused by a software failure (right-click my Computer - Manage - event viewer)
check each category for any items listed with a red stop sign.
could also be a bad power supply, power surge (are you using a surge protector?) or a bad motherboard
randyval said:dust and dirt might be causing it or it could be a driver issue, have you recently updated any drivers/ hardware?
psu might be dying, what are your system specs and what is the max output of your psu?
do you have all the updated mobo chipset drivers/ ethernet/ video drivers installed?
check all plugs and connections , make sure they are all secure
what does it say in your event viewer?
psu= power supply, check it for dust and dirt.MrMarcus said:hmmm... psu, mobo chipset driver... sorry, I have no clue what u r saying! LOL I'm IT-impaired
philly said:MS just released a whole bunch of updates/patches. if your PC is set to install updates automatically, it will reboot your pc if it has too. but it usually tells you it did those updates and had to reboot. so i guess i'm no help here...
Doran said:Could be a bluescreen error, and your system is configured to restart instead of showing/leaving the blue screen on the monitor.
If you right click on "My Computer" and choose Properties, navigate to the Advanced tab - and select the Settings button (green) it'll open up the window on the right. Check to make sure the highlighted checkbox is empty - otherwise when your computer crashes, it just reboots instead of showing an error message which can help narrow down what is causing the problem.