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A system fan is notoperating correctly the system Bios has detected a system fan is not operating correctly

System fan (90B)

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Check operation of the cooling fan(s). Could be running slowly or not at all

Posted on Feb 14, 2014


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Laptop fan is lod and error code on startup then quiets down

How To Fix The HP Notebook System Fan 90b Error Message On Startup?
The HP Notebook System Fan 90b Error Message On Startup indicates a serious problem which exists in relation to the heat removal process. Here, as per as HP technical support study is concerned, one of the two possible events is possible: first, the system fan is not at all spinning or even it may be the case that the system fan is not spinning properly and the second cause may be the temperature inside the case which is too high and the fan can't spin fast enough to remove the heat situation.

Steps to fix the HP Notebook fan error 90b
Step1: Working with the exterior vent
·If a user is noticing that the system fan is spinning and is blowing quite warm air from the computer, then cleaning all the exterior vents to remove dust buildup instantly by blowing air through the vent openings is necessary. This should be done while the computer is completely in "off' mode. Dust can further accumulate inside the vent opening and all around internal cooling components to prevent the heat removal process.

Step2: Perform a instant hard reset
·Performing a hard reset can further reset all the recorded thermal values in the memory by enabling you to work with the computer again even if it's only spinning for a short time to access. Save all the important files before it is in service process.

Step3: Updating the BIOS
·While updating the BIOS set-up, it may further help prevent this critical error from occurring in future as suggested by HP Notebook support
Step4: Computer servicing process
    ·Enable the computer service to easily clean up all the internal components and then replace the system fan carefully if necessary. Ensure that all the following items are well addressed while servicing
    ·Thoroughly remove all the available dust from all internal cooling components in the device.
    ·Ensure that wires from the system as well as from the CPU fans are well connected to the motherboard in secured mode.
    ·Ensure that your system fan blades are spinning correctly, and are not producing any unwanted noises. Replacing of the system fan is essential if it's not working correctly. Your above issue is now resolved completely. But do call us if you still have problem with your HP Notebooks at HP notebook Customer Support Toll-Free 1-800-213-8289 section anytime.

Mar 24, 2014 | HP ENVY m4-1115dx 14" Notebook PC -...

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Screen says the system has detected that a cooling fan is not operating correctly. System fan (90B). The computor is 2days old. by pressing enter the computor operates ok. please advise. thank you

I would take the laptop back to the store I bought it from and ask for an exchange. Changing a fan on a laptop can be a very intense process involving removing the entire motherboard. This could also be a bios setting issue but to seek advice from someone who hasn't touched the laptop for a fan issue is not a good idea. Heat is a laptops worst enemy and the only things fighting that enemy are your fans.

Feb 28, 2013 | Computers & Internet

1 Answer

Compaq CQ56-219WM says system fan 90B is not operating correctly

this is what i did. Open my laptop, get out the motherboard and disconect the fan, change the termal sink, clean all inside, reconnect all and ready, then when you got it, change the cpu fan, i got it, it cost to me only 16.50 dlls. My laptop is now running properly.

Dec 27, 2012 | Compaq Computers & Internet

1 Answer

System fan 90b not working

Check for dust build up. If non then the fan needs to be replaced.

Apr 03, 2012 | HP Computers & Internet

1 Answer

I get this message when I turn on my laptop. It's almost a year old. "The system has detected that a cooling fan is not operating correctly. Continued operation is not recommended and may...

More that likely the fan is going out. Check the fan exhaust to see how much air it is moving if any. A laptop cooling pad will probably help out and possible prolong failure. If its under a year old, the maufacturer may fix it for you. You'll just have to contact HP and see if they will, or if they can get you a new fan to replace yourself if they wont do it for you.

Sep 11, 2011 | Computers & Internet

1 Answer

My system operating fan 90B is not operating correctly

If you are having problems with the cooling fan the best solution is to replace it. Fans are very difficult to actually fix unless you know how to replace the copper coils which are used to create the magnetic force used to turn the fan mechanism.

Jul 03, 2011 | Compaq Computers & Internet

2 Answers

When my laptop boots up it says operating system not found

Not good. Check your bios for correct drive for boot up, but it sounds like yoru hard drive is not being read....

Oct 26, 2010 | Acer (ACERMOTHERBOARD)

2 Answers

Wont boot.

normally this happens if your MB sensor circuitry is not detecting the correct speed of your fan or the correct temp of your system and proc. Try to Load the default settings of your bios and test again. if still having same problem what I suggest is check the 12volts output and 5 volts output of your PSU. To check it you need a Multimeter set to DC volts and put the negative probe to the black wire in a standard PSU plug and the red probe to the yellow cable (for 12v) and for the 5 volts just transfer the red probe to the red cable. If you have the correct voltage output, you have to hot wire your Proc Fan to get DC supply directly from your PSU. Your Proc Fan normally runs using 12volts DC.

Hope this helps.

Apr 29, 2008 | Intel D865GVHZ Motherboard

2 Answers

Reseting the BIOS on eMachines 270

brand and type of ur mobo, in moust of the time a restore to factory defaults is the solution, or go to hardware monitor and disable the fan speed  sensor, or check on the mobo that the cpu fan conector is in the right place, if this will not fix le't me to know

Oct 18, 2007 | E-Machines eMachines Desktop PC

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