Variable speed fans suddenly slow single speed only.

most in that case have problems in the bios. auto running when power cable is attached.

Hello
You can find your driver at :-
{{{ ThinkCentre M50 Drivers }}}

http://www-307.ibm.com/pc/support/site.wss/migr-50534.html

Drivers For Free Ibm Thinkcentre M50 8187 Audio and Sound Drivers

IBM ThinkCentre M50 8187MMG Drivers Download for Windows 10 8 1 7 Vista XP

This link will take you where you need to go.. I recommend that you Download/Install any/all Current Updates for your Model.
http://www-307.ibm.com/pc/support/site.wss/TCTR-MATRIX.html

open case and see if the fan is dirty, clean it with canned air if that solves the problem your set. If it doesnt solve your problem then the Fan will have to be replaced ,in order to keep the cpu cool.

The fan may not stay on all the time - its a feature of laptops to help save power. The fan is also variable speed. As the CPU gets hotter, the fan speeds up. When the CPU isn't being used as much and is cooler, the fan slows or even stops. It turns on to full speed when you first turn the laptop on as part of the BIOS system check.

The noise is another issue. You could have a broken "fin" or fan blade. The bearing could be going out. Something may have simply "crawled" inside the fan's output vent. In any case it may be worth your time to have a professional open up the laptop and look at the fan. I have heard a LOT of noisy laptop fans in my day, and believe me it's not the worst thing to put up with.

Thanks for asking ...simply check the power supply fan....remove the Power supply(SMPS) from your system 1st....then remove the fan in it....try to rotate it by hands.....if it is not rotating smothly then it needs lubrication & your power supply unit needs cleaning.....if it is working fine then check the fan power section in Power supply...
regards

Hi,
http://www-307.ibm.com/pc/support/site.wss/TCTR-MATRIX.html
Here is what you need. Just click the Link Above and select your model. Please Rate My Response! Thanks!
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Hi, Have you checked the cpu cooling system, usually this happens if the heatsink does not sit on the CPU surface or there is some air gap, use heatsink compound to fill up the gap , or sometimes the fan RMP is slow cause of wear /tear.If not then check your ram and PSU.
Let me know

Diagnosis: Lack of P.S.U. fan speed report indicates P.S.U. fan sensor damaged by overheating. This was caused by cooling fin blockage since the Sony design on this model cools the C.P.U. THROUGH the P.S.U.
Expert level fix: Remove P.S.U. Remove C.P.U. fan and vacuum. Remove C.P.U. cooling fins from C.P.U. and cooling fan mounts from fin box, vacuum. Reassemble C.P.U cooling system. Replace P.S.U. with O.E.M. part only since in this case it is proprietary to the unit.