I unfortunately had a failure of my CPU heatsink fan, and I was out of the room while it was happening. I have ASUS PC probe always on and running in t he background. I Heard it beeping, and I ran in to check it out. My CPU temp zoomed from its usual 35 C to about 75 C. It was there for maybe no more than minute or two. I yanked the cord and let it cool. I rebooted it and got into the BIOS to check out fan speeds and such. The core CPU temp was slowly creeping up past 40 C and the CPU fan was definitely hurting (spinning only at about 500 RPM). I've looked at the "is my cpu too hot" sticky, and I know that running anything above 70 C is bad. However, I wanted some practical advice from more experienced builders on the likelihood of the processor being toasted. So, needless to say I need a new heatsink/fan which is fine. My big concern is did I do any permanent damage to the CPU? That's what I'm concerned about the most, since if I did fry my P4 this means that I'll have to go ahead and get the new A8N SLI board and pick up an Athlon 64, and that means getting a new video card (nudge nudge wink) with PCI express. My wife certainly won't be pleased.