Iv just installed a new heatsink/fan on a friends computer because his old CPU fan had a run in with some power cables, but it is now getting a cpu fan error on startup. I have tried with both the fan in the cpu power socket and also the cpu socket for his fan controller but neither seem to work. Its an old 1.3 duron on an even older motherboard, so im not 100% sure what it is. I think its probably the fact that the mo-board is now getting too low a rpm reading (old fan was stock slim line 70mm fan new one is chunky 80mm) but im not sure how to get off the error screen and get into bios? Strange thing is that I seemed to work when the fan was not plugged in at all but it didn’t like the fan controller…. Anyone got any ideas?