CPU Fan Failure

Hewlett-packard Pavilion a6000n desktop
August 13, 2010 at 13:29:13
Specs: Windows Vista
So a while ago, I booted up the computer and it gave me a CPU Fan Failure message saying that it would turn off in a few seconds to prevent further damage. However, after that happened, it wouldn't turn on for more than 2 seconds and then it would shut down. I replaced the power box and it allowed it to show me the CPU Fan Failure message again. However, the CPU Fan is running just fine. I researched and saw that getting into the BIOS could fix it. But, I don't know how to get there. I'm not a computer engineer or anything, so I need things simple. I'm hoping this is a simple fix. Would getting a new CPU Fan fix it? Thanks.

See More: CPU Fan Failure

August 13, 2010 at 14:17:56
When you boot up your computer it should display on the screen which key to press to get into 'BIOS' or 'Setup'.

If you get into BIOs and have no luck. I would try buying a new CPU fan and replacing your current fan. You may need to reapply thermal paste between your CPU and new fan.

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August 13, 2010 at 14:33:02
Is it the same thing as "Boot Menu"?

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August 13, 2010 at 16:47:25
If the CPU fan is not turning fast enough the sensor will consider the fan not working.

The BIOS may be labeled as SETUP on your start up screens.

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August 13, 2010 at 21:12:49

Actually, no -- boot menu isn't the right place, although you're close. By googling the make and model of your computer, it seems that F10 is the key to enter the BIOS. As soon as you see any information come up after pushing the power on button, begin pressing F10 repeatedly and rapidly. At some point prior to loading windows, the startup process will take you somehwere that you've never seen before -- the BIOS menu. It will be a very 1982-esque low quality graphics screen. Read your options carefully in this menu. It is always possible to undo the changes that you make, but it is usually recommended that you not change settings in here unless some instructions tell you to.

Not having your computer in front of me, I'm not sure what changes to make to the BIOS to fix the problem, but what I've given you here should at least get you to the BIOS settings.

By the way, Boot Menu, unless I'm rather mistaken, gives you options such as "Safe Mode", "Safe Mode with networking", "Run System Scan", etc. -- these are really just options for turning on and off major features of Windows.

Let me know if this helps.


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August 17, 2010 at 10:44:03
the_photon: unfortunately, the CPU will still not stay on long enough to get to the BIOS. It shows me the blue screen that says HP and gives me the options for Setup, etc. but when I hit F10 it doesn't take me to it because it shows me the CPU Fan Failure message. If you have any more ideas, I'd love to hear them.
Thank you, by the way, for all the help everyone has given me already.

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August 17, 2010 at 13:54:39
Open the case and watch the CPU fan when you attempt to start the computer. If it isn't rotating fast or not at all the fan needs replacement.

Go to the link below and look at the extreme right side of the page. There is a column of pictures of various CPU heatsink/fan units. That will help you to understand what you are looking at.


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August 17, 2010 at 14:23:00
You may need to reapply thermal paste between your CPU and new fan.

You do not apply thermal paste between the CPU and Fan. The thermal past goes between the heat-sink and CPU. The Fan sits on top of the heat-sink and is screwed into place. There is no need to remove the heat-ink to replace the fan and therefore no need for thermal paste.

If the CPU fan is suspect in any way it should be replaced. They are not expensive at all, a lot cheaper than a burnt out CPU.


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August 19, 2010 at 18:50:07
You all have been VERY helpful and I greatly appreciate it. But I have one more question (which might lead to another five questions). I have finally made it into the BIOS! Now I need to know what to do to make the CPU Fan Failure message disappear. So if you could help me with this, I would be very appreciative. Thank you.

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August 19, 2010 at 19:53:50
You may not be able to. Have you found a screen with system temperatures and voltages listed?

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August 19, 2010 at 20:00:47
No. The tabs on top are:
Main, Advanced, Power, Boot, Exit
Underneath Power it says:
After AC Power Failure [Stay Off]
Virtualization Technology [Disabled]

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August 19, 2010 at 20:07:33
Either your BIOS is very limited or you haven't found anything related to what I mentioned.

Try a different approach. Download and install a program called SpeedFan. This utility can show the fan speeds and you can change the settings in some cases.

At the very least SpeedFan should tell us if your CPU fan is defective. Get SpeedFan at the link below.


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August 21, 2010 at 22:59:40
Okay. So Some new info. I got into the BIOS, changed a setting (a non-consequential setting) and hit F10 (save changes and exit) and when it rebooted, it worked. However, when I turned it off and back on again later, it showed the same CPU Fan Failure message. But if I go into the BIOS, make a change, and hit save and exit, it will work.

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August 22, 2010 at 06:09:25
Elaborate on the setting you mention.

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August 22, 2010 at 14:07:17
I disabled a "floppy drive" i believe it was. But, the thing is, it doesn't seem to matter what change I make, only that i actually makea change and then save and exit.

Also, as I was trying other things, I hit ESC for the Boot Menu and "Booted from the CD Drive" (or something like that) and it worked once again.

I apologize if I'm not very clear, but I'm ignorant in the finer points of computer hardware.

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August 22, 2010 at 15:08:32
So, did you download SIW? I would like to see what the fan speeds are.

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