I haven't been over to inspect it, so I can't accuratly describe what happened, I am taking the word of a guy who knows nothing about computers and who took upon himself to do something I told him I would be happy to do for him if he could wait a day. His kids were on vaction so no one was going to be using the computer anyway they have the adult computer and a kids computer. I am just glad what ever happened, happened to him and not me, as I can't afford to replace someones computer, I still need some stuff for own machines. But he had the same problem the first guy posted. This guy didn't relise he pulled the CPU out, but he mounted the new fan, and tried to get it to run. He later called me and asked why the fan would run but the computer wouldn't start to boot. I figure he is pretty muched screwed.