fan on processor runs at high speed

The fan that sits on the processor now sounds like a jet taking off and runs at a high speed. This is a Lenovo desktop M Pro. It did this 2 times before but would calm back down, now it stays at high speed?
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Dennis MillerAsked:
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JohnBusiness Consultant (Owner)Commented:
First, check your BIOS for an update. Some Lenovo desktops would do that (going back a few years) and the answer then was to update BIOS.

Also check the PM Driver (Lenovo / IBM Power Management Driver). Lenovo is frequently revising it and updating it may help.

Now run Task Manager by right clicking on the Taskbar. Set the options to Hide when Minimized. Minimize it and it will go in the system tray. It should always (95% of the time) be dark green. Is it bright green, that is, high CPU kicking off the fan?

From a hardware perspective, you may have a very dirty machine inside that needs to be cleaned and dirt cause overheating.

Check the thermal compound between CPU and heat sink. It may have dried out and needs to be replaced.
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Dennis MillerAuthor Commented:
Really good answers. I had already cleaned the fan and inside the entire desktop and reseated pretty much everything just for grins. I will update the bios and see what happens and then try the rest Monday when I et back into work. Thanks again and I will hold out hope.
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nobusCommented:
install speedfan - and check the cpu temperature
if it runs too high, you may need to renew the heatpaste on the cpu
http://www.almico.com/speedfan.php
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Gary CaseRetiredCommented:
If replacing the thermal paste and blowing out the "innards" doesn't help with this, it's likely that the thermal sensor that's used for speed control by the motherboard has failed.

If that's the case, a simple "fix" (workaround is a better term) is to install a Zalman FanMate.
http://www.newegg.com/Product/Product.aspx?Item=N82E16835118217
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Dennis MillerAuthor Commented:
well I am pretty sure now it is the old fan. It would work then shut off and finally the fan just stayed at a high speed which tells me the fan and or cables or the paste is definitely causing this. I ordered a new one and a speaker as that was bad as well. I wish to thank you all for your help.
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Dennis MillerAuthor Commented:
These were all excellent answers and would recommend to all with this issue that these answers help for multiple issues. Thanks again techs. The paste as I was told from another tech is really a killer that most never even know exist. Great help. Fast answers as well. Another reason why I love this site.
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JohnBusiness Consultant (Owner)Commented:
@millerdog  - Thanks for the update and I was happy to help.
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