PC rebooting itself

[gamezaddic]

My pc reboots randomly after entering windows. Sometimes it would reboot when im in the bios and sometimes it reboots after entering windows when I can see my desktop.
I tested the processor, hard drive, graphics card. Any ideas on what might be causing this issue? Thanks.

 

[dr.sandman]

best guess is that its the powersupply but you will just have to keep replacin parts until it stops rebootin.

 

[Nenu]

Its possible you need to relax the timings or slow the memory down if overclocked.
Try using single ramsticks one at a time and if that works, try both again.
Blow any dust away from the slots first.
This will show if one stick has a problem, running more than one is a problem or if there was a bad electrical contact.