Question about HP Pavilion a1720n PC Desktop

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New case fan running but still getting error message system fan failed.

Was getting ERROR:System fan failed...F2 to continue because my PC had no case fan. Installed new case fan and it does work. BIOS reading system fan 425 rpm. Connected to mobo with 3 pin. Still getting error message when booting.

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  • HP Master
  • 5,660 Answers

Did you try;

Power off, power unplugged to computer.
Press the Power On button, and hold it in. Hold for a count of 10 seconds.
Let go.

Do this procedure two more times.

Plug the computer back into power. WAIT 1 minute, turn the computer on.

This method clears CMOS Error Codes, and sets BIOS Setup back to the factory default settings.

CPU fan spinning at required minimum RPM's?

Not talking about the SYS_FAN (Case fan)


Posted on Jan 18, 2013

  • 7 more comments 
  • SJCadoo Jan 20, 2013

    CPU fan running just fine.

  • SJCadoo Jan 20, 2013

    Not very familiar with tech stuff. Nervous about reseting BIOS. I might just get someone to do that for me. Will keep posted on solution.

  • joecoolvette
    joecoolvette Jan 20, 2013

    I understand. But you're not resetting BIOS, just the BIOS Setup parameters. There is no way it wil harm your computer. However let's go with the person who will help you. Do appreciate hearing back on this. Regards, joecoolvette

  • joecoolvette
    joecoolvette Jan 20, 2013

    Pggh! Multi-tasking and it isn't working very well, lol! The main thing is you are clearing CMOS Error Codes.

  • SJCadoo Jan 21, 2013

    Thanks for the advice joecool, I'll give it a try. (my buddy will)

  • SJCadoo Jan 24, 2013

    Had the Bios updated. All is good.

  • joecoolvette
    joecoolvette Jan 24, 2013

    Excellent! Glad to hear it! So you updated the BIOS, or did what I posted?

  • SJCadoo Jan 26, 2013


  • joecoolvette
    joecoolvette Jan 26, 2013




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SOURCE: when booting get msg: system fan has failed...

That is correct. Also, while you are inside the Pc check the connection to make sure it is tight. If the inside case is dusty, blow it out with a can of compressed air from wal mart. Most modern motherboards have sensors built in and software that monitors temperatures of your hard drive(s), CPU's, Inside case, and even video cards. It's nice to know that the software notified you as it was suppose too. Oh by the way, nice system! Hope this helped.

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SOURCE: Desktop PC system fan failed error

hello.. this means that the fan which cools your pc is not working, get a new fan for your mode and fit yourself if possible or go to computer technician.
do not keep it using as your pc may crash.
its very important to keep the cpu cool to keep computer working. hope this help.
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SOURCE: 920-fan command 2 pin connector not connected

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SOURCE: system fan has failed

When the system fan or cpu fan fails you will get this message, or sometimes the computer will actually start, but then shut itself down. The only way to fix this problem is to replace the failed or failing fan. If you don't know how to replace a fan inside a computer, then I highly reccomend that you hire someone to replace it, or get a friend who knows what they are doing, to replace it.

Posted on Jun 18, 2009

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