martian said:
If RAM was the Culprit, your PC won't be booting up in the first place! I think the problem is probably with your SMPS (PC's Power Supply Unit)... It's not able to provide enough power to your hardware.
no you are wrong. it could be bad RAM.
@ABHI: u should turn off quick boot from ur BIOS and then see whether the ram test passes. or if u want to do it with style and u have lots of time and want to know for sure then use 'memtest'
there could be some driver/device problem or some other software triggred restart.
do this>right click on my computer>click properties>advanced>start up and recovery settings>here uncheck "automatically restart" under system failure.
this way if it is a soft/OS problem u will see a blue screen. then post that error here.