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CPU fan error at boot.. Spin fan manually at power up and it works. Why is this? Fan continues to run just fine until computer is powered down

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  • HP Master
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The fan needs to be replaced. When you provide the "umph" to start the fan, it is able to continue by itself. The exposure to heat and the accumulation of dust and dirt has begun to interfere with its ability to start from a stopped position.

The fan should be replaced with an identical fan - preferably from a new CPU heat sink. Do not replace the entire heat sink unless you are prepared to clean the CPU and apply new thermal grease, etc. It is far easier (and probably just as good) to replace the fan only by removing both the old and new fans and swapping out.

Eventually, starting the fan by hand will no longer allow the fan to run by itself. It is better to make the repair now than have the fan fail and cause the CPU to over heat - possibly catastrophically.

Good luck!

Posted on Sep 15, 2010

  • Steve Sep 16, 2010

    When I say replace the fan with a "new CPU heat sink" I mean the fan from "a new identical CPU heat sink". The size of the heat sink for the particular CPU changes the physical requirements of the fan. Replacing with one that won't provide sufficient airflow due to slower speed, blade pitch or angle, will have ill effects of the ability to dissipate heat from the CPU. If you can't find the identical heat sink / fan combination - you'll have to replace the whole assembly for proper heat removal.

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Posted on Jan 02, 2017

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


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.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00864946&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3340228#N436

CPU fan spinning at required minimum RPM's?

Not talking about the SYS_FAN (Case fan)



Regards,
joecoolvette

Jan 18, 2013 | HP Pavilion a1720n PC Desktop

1 Answer

When I plug the unit into power, the CPU fan runs very fast but no boot, and then when I press power on the fan slows down and the PC boots normally. It shuts down in about 30 minutes with no sign of...


Sounds like you are overheating. One way to tell if it's overheating is you say it will run for about 30 minutes then shuts down. When it shuts down try rebooting to see if the boots successfully. If it fails to boot successfully right after it shut down then you are probably overheating. If you wait awhile to let it cool down for 30 minutes or so and if you reboot and it does it successfully you definitely have a overheating problem. If I remember correctly all those compaq sr series have loud and fast running fans. Computers overheat because of three reasons for the most part: 1) A fan has stopped working. 2) The Thermal Paste on the CPU and Heat Sink has dried up or is not thick enough to keep the unit cool. 3) Dust has clogged the fan vents and inside the computer. Fortunately for you desktops don't have to be completely disassembled like laptops to get to the fan, CPU and heatsink. Just pop the case and you'll see the components attached to the motherboard

Mar 18, 2012 | HEWLETT-PACKARD Compaq Presario SR5518F...

1 Answer

HP P4SD, its running good with 4 gb RAM, P4 3.0ghz, and a couple sata hd. The problem is the fan output voltage, i havent been able to read the output chassis and cpu cooler pins voltage cause i can find...


"i can find my dmm?" did you mean CAN'T?
"its clearly off", what is off?
the fans are 3 pins,2 are power, one is RPM tachometer.
"it all works fine", so you can boot and run any OS, ?

"the voltage reads +12vdc", where, at fan or PSU?
the fans run off 12vdc, they are DC motors (from outside fan)
if the fan runs slow at 12vdc the the fan is bad or is a low RPM
fan, as some are, bigger fans run slow, for less noise.!

first is the CPU fan it must run full speed, if not the CPU will overheat in seconds and ALL CPU shut them selves (by there selves) this way. so CPU fan is first. what does it do... there....?

then BIOS screens. GOT BIOS UP? and running? with, ESC key pressed>.
let me guess your symptoms
1: PC dead. will not boot.
2: BIOS dead.
3: all fans DEAD,.
4: power switch works and all PSU voltages read right, (seems not)/?
5: if the PSU power wire reads right(DMM), matching the side sticker voltages, and the CPU is dead, the MOBO is dead, or CPU is toasted.


here is a modern PSU, sticker.
see 5 to 10 power lines, see them. all must read correctly
if a fan is dead, then its dead if 12vdc is present on the fan power pins.




psu-dsqaqngzuibs2svxh2bga4t0-2-0.jpg

Apr 28, 2017 | HP Asus Motherboard P4SD-LA Socket 478...

1 Answer

I hit the power button and the light blinks once, the fans will start to spin, and then nothing, no power no boot, just a quick blip of power but no power up..


You need to remove the case top and look for a lot of Dust all over the inside, especially around the CPU making sure the cpu fan is still running. This can get expensive when maintenance procedures are not thought of until late. It's not you it's everyone. With the power cord out, maybe you have a vacuuum attachment to get in there and get rid of a lot of spider webs. Then take a slightly moistened rag and complete the job. I can't guarantee your CPU fan is still alive but when you get all cleaning utensils out of the way, put the power switch on and watch for the CPU fan to spin. If not- any lights? P.S. Fan?

Apr 17, 2010 | Dell Inspiron 531s Desktop Computer

1 Answer

I have a Compaq Presario SR5233WM PC. My problem is the tower over heats and does an auto shut down. Has anyone else seen this before?


This happens when the CPU overheats and shuts down (ie thermal overload) and won't boot up again until it has cooled down. If the problem is not rectified, eventually the CPU will fail.
The problem is caused by a faulty CPU fan and or the fan and heat sink assembly is clogged with dust. The switch mode power supply fan may also be faulty or clogged with dust.
Check the CPU fan, if it does not spin freely then replace it. Also loosen and vacuum the dust off the heat sink.
Check the switch mode power supply fan, if it is faulty replace the fan or better still replace the power supply.

Oct 09, 2009 | HP Presario V6420US PC Notebook

2 Answers

Fails to boot, fans and lights on, no bios or anything


My recommendations would be to remove all connections to the board.
Remove the CMOS battery.
Remove the CPU fan and CPU.
Look at the top of the CPU, if you have a crust over the top of the CPU, you will need to remove it to a clean surface.
Next, your CPU fan should be a 3 wire connection on the motherboard, within two inchs of the CPU holder.
After cleaning the CPU, re-inseart and apply a heat sink lub for good heat transfer.
Re-install CPU fan and plug in to board connection.
Re-install your CMOS battery and power up unit.

With the CMOS battery removed, the time and date will need to be reset.
Also, in the BIOS for that board, you should be able to see temps. and rpm readings. ??
Hope the CPU has not taken a dump on you.!
Before you plug in the drives and other devices, check temps. rpm and voltages.
Have fun, hope this has helped you.

Oct 06, 2009 | ASUS P5GD1-VM Motherboard

3 Answers

Laptop not booting


Before anything make sure the air vents are not clogged. You can used canned air to blow out the air vents to make sure there is no buildup of dirt or dust cause that can cause overheating problems.

Look to see if the CPU fan turns on at all during the whole bootup process. The CPU fan won't run all the time but as long at its turning on at all during the bootup process then you know the fan is good.

If the fan never turns on at all and the laptop gets very warm or hot and then shuts off then the motherboard is bad cause that means to much voltage is going thru the motherboard and it can't cool down properly.

Hope this helps. If you can't physically see the fan turn on then where the cpu fan is located put your hand there and see if you can feel air flowing thru, hopefully it won't be hot air but slightly warm.

If you need any other info, let me know and I'll help you further.




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1 Answer

Dell Dimension 3000 CPU Fan does not run


I agree with both of you. As long as you are not experiencing any heat event (shutting down and rebooting) just ignore the error message. If the fan is on and running at a fair speed, you shouldn't have and problems.
Now should you start to have heat problems, don't boot the computer until you have a larger CPU fan in place...and too you may be able to add an additional fan to the system for reassurance. the added noise is worth the security of not having a CPU meltdown.
Those large 120 are very quiet and move air, if you can find a place to hang it.
Good luck, hope this helps. please leave rating -thank you kindly

Apr 20, 2009 | Dell Dimension 3000 PC Desktop

2 Answers

Computer keeps shutting down.


Do the fan's spin when you power the PC on? All of the fans should spin up for at least a second upon initial boot. The CPU fan and video fan (if you have an external card) will spin the entire time the PC is on and vary in speed depending on temperature.

Try booting the PC with the side of the case off and note and fans that aren't spinning. The temperature to shut off the CPU is really high. If the temperature is getting hot enough to do this, you should notice a failure in a fan right away.

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2 Answers

Not booting but RAM,processor,SMPS ,HD are fine.


Check without Video Card, Processor , Memory and beeps are coming

If no then this is motherboar issue, I had the similar problem. So went to the local repair shop and got the power capacitors replaced,

Jan 29, 2009 | Asrock P4i65GV Motherboard

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