On my Dell Deminsion 2400 i took out the P4 2.40 nad tried a P4 2.66, at first it did not go in but i straightned some prongs and it went in. i but the heaksink back on but i did not book up, i gave up and put my P4 2.40 back on, its not booting up. This is a hugh problem. It makes noise the fan runs but then it just stays at a stady hum and the screen never picks up anything. I need help and if worst comes to worst i need info on a new board i guess?Someone please help!!!