Why system restarts

[Guest]

Hello,
I have formatted my hard disk still my system restarts automatically. I tried to start in safe mode but in vain can any one suggest me in this regard

 

[Gandalf]

Try resetting your BIOS to its default settings.

 

[aford10]

At what point in the boot process does it restart?
Do you see a BSOD?
What are your hardware specs?