I woke up yesterday morning to find my computers power light flashing and making a strange drilling sound. i thought this was strange as i hadnt left my computer on all night. I turned it on and it powered up ok, then it locked up when i tried to use the keyboard. then suddenly the power went off. i tried turning it on several times after this but it would not power up. So i went to 'pc world' and bought a new power supply, after fitting this it still wouldnt power up. Has anyone got any ideas? i was thinking i might be the motherboard, should i go out and buy a new one today?