Hey all, Merry Christmas. Right on Xmas even I have come accross a major problem and I really hope someone can help me. I'm pretty worried! The situtation: My brother bought a new CPU fan for his LGA775 processor weeks ago and today I finally got some time to install it. So I took everything out of the case, installed the fan like it says to. I had to remove the MB from the case since his new fan attached with screws from the bottom instead of just "snapping" on from the top like the Stock Intel Fan. So I boot up the system... and the second the system starts to intialize... the thing shuts off dead. I know P4 boards have a 4pin connector near the mobo which I have never been clear if that was needed. If I have it off, the system wont shut off, but it wont boot either. With it on, it will start to boot for a split second before everything goes dead. I did not change anything, except of course putting a new fan on. I did not plug in some of his case fans because he had more than he needed going but I dont see why that would cause a problem. I did notice one thing when I put the fan on is that the motherboard was slighting bending from a side view now. I dont think I have it on too tight... or if I loosen it I dont know how much I should since I know the fan and cpu need a very snug fit. I'm at a loss as to what's wrong or what to do. This is his only computer and he needs it. Any advice I would be so greatful for. Should I try to put the old fan back on? Just to see?