I clean my pc by taking out all wires from motherboard. after i cleaned the cpu my pc didn't turn on it gives only a short sound like tik.not even motherboard starts.then i took out power wire which sends start signal to mobo and tried to start my mobo using a screwdriver and when i touched the power pin with screwdriver then also the same problem it gives a shirt tik sound and doesn't start at all. Plz help!!!