Joe..I was told it's dangerous to open the PS..?????? I just may find it easier to replace the whole PS..rather than mess with the innards. It's a few years old..at least 3-4 years old. And my pc is on 24/7 Jackie In a message dated 12/20/2005 6:38:16 PM Eastern Standard Time, cuffy10@xxxxxxxxxxxxx writes: I'd measure the fan in the PS and order it along with the other one. It takes about five mins to change the fan and there's no point in changing the PS unless it quits.