I swapped out a CPU in an old machine (XP) today and on starting the machine the CPU fan kept running at full speed.
I swapped the CPU (Pentium 4 @ 3.2Ghz) again with another known good one (Pentium 4 @ 3.0Ghz only difference is the L2 cache size) to check if the CPU was the problem but it still runs at full speed. The heatsink itself is almost stone cold even after half an hour's running.
I used fresh thermal compound each time (Noctua HT-N1) after thoroughly cleaning / preparing the two surfaces.
I have Googled to see if the fan itself could be at fault but cannot find anything related to it.
Have also checked the BIOS and the fan speed is enabled by which I take it that it will run at whatever speed is necessary for the CPU temperature?
So unless the fan itself has a controller / sensor (Intel) I don't know what to check next apart from finding another fan to put onto the heatsink.
Does anyone know of a check I can do with a multimeter or an app for instance on the fan to check it's operation?
Meant to mention the board is a Intel 915GAV.