CPU Fan Speed

revlimit

macrumors member
Original poster
Nov 13, 2011
34
0
So 1 of my fan on my dual CPU 4,1 is running at full speed. I've tried swapping out heat sink but that didn't resolve the problem. Tried doing the SMC and the PRAM reset as well. I've installed the fan controls but that didn't resolve the issue as well. So it is something within the board that is causing it. Anyone have anything else I can try?
 

h9826790

macrumors G5
Apr 3, 2014
12,766
5,577
Hong Kong
Did you upgrade the CPU by yourself? If yes, any details? e.g. How you did it.

Is this issue appear all in a sudden?

Did you see any red LED on the mobo?
 

revlimit

macrumors member
Original poster
Nov 13, 2011
34
0
Did you upgrade the CPU by yourself? If yes, any details? e.g. How you did it.

Is this issue appear all in a sudden?

Did you see any red LED on the mobo?
The CPU is the original 2.26 GHZ. I purchase the board off someone. I have a feeling it maybe a temp diode on the board that's gone bad. I didn't notice any red LED. I was trying to run the Apple Hardware Test but I was unable to start it with instruction discribe on the web of holding the D key down upon bootup.