[SOLVED] Pc restarts randomly

[Xerofirt]

my pc is i3 3220,the pc was fine but after 5 days i have to switch on and off computer to get start my pc and once it start it run through out day but once i shutdown it for long hours like 5hrs the same on off procedure i have to apply but now since 3 days my pc is countinously restarting without fix time between 2sec to 4 hour i replaced ram,psu,bios battery,used thermal paste under heatsink,formatted hdd with new windows 7,no graphic card.

 

[Vyrvelata]

What is the motherboard, its possible to have leaking capacitor.
Check the capacitors on your board!