Question about Dell OptiPlex GX520 PC Desktop

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CPU fan runs at high speed and won't boot

Dell OptiPlex CPU FAN is runing at high speed

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  • chajackson Jun 20, 2009

    It never gets that far in the POST. Nothing seems to be overheating, CPU or HD, all connections are tight.

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Check the power supply for problems.

My computer wouldn't run thru the post up, no beep codes, only the fan running on high. The power switch didn't shut the computer down, it needed to be turned off at the power supply, or unplugged.

I replaced the motherboard to no avail. Only after changing out the power supply did it work correctly.

My theory is that the power supply quit supplying power to the motherboard, but kept supplying 12 volts to the fan.

The good news is that power supplies are cheaper than motherboards and easier to replace.

Posted on Oct 24, 2009

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Change the setting in the BIOS menu. reboot your computer.. when you see the dell logo.. press F1 (or F2 if F1 doesn't work) button until you see the BIOS screen. Check for fan options and change it

Posted on Jun 20, 2009

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Take your memory out and try turning it on. You should get a beep code. Put one memory stick back in and turn it on. If the fan still runs high try a different memory slot and if that does not work try a different memory stick.
My experience shows that their could be a memory problem.

Posted on Jun 12, 2013

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Eric

I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771

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This program will control your fan speed based on your cpu temp. It's main use is to quiet fan noise.

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