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Why do my PC fans spin really fast and no startup?

Hi, so one day I went to use my PC, and when I try to power it on the fans spin really fast and there is no startup. I tried a different PSU and it worked for a bit then my PC shut off, and I tried powering it on, and same thing. So I took that PSU out and put it on another motherboard (the PSU I took out worked on other PC’s). Then I try using that PC and the EXACT same thing happened. I am super irritated by this. Does anybody know what is wrong?

Thanks in advance!

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Hi @random_user_101 ,

What is the make and model number of the desktop computer or if it is a custom build the make and model number of the motherboard?

It may be that the BIOS is corrupted and it can't POST properly.

Disconnect the AC power from the computer and check if there is a button cell battery on the motherboard.

If there is gently remove it (note the orientation so that you replace it the correct way) and then press and hold the computer’s power button for 10 seconds and then release it.

Reinsert the coin cell battery , reconnect and switch on the power and then try to start the computer.

If it starts OK if may be that the battery has been depleted and needs to be replaced.

Be aware that this will restore the BIOS settings to their default value, so if you had any settings tailored for specific hardware/operating requirements you’ll have to go back into BIOS and change them back to what you had

This battery maintains the BIOS settings when the PC is powered off and when it starts to deteriorate the settings could become corrupted.

They usually have a life span of 5-7 years and are not the rechargeable type.

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My motherboard is a Gigabyte GA-G41M-ES2L

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Hi @random_user_101 ,

I'm wondering if you have 3 faults now.

One on the 1st motherboard that caused the PSU not to work, and then when you changed the PSU it caused that to fail also and now it doesn't work either on other PCs.

So 1 fault in the motherboard causing 2 PSUs to have problems or a fault in the 1st PSU which affected the motherboard which then affected the 2nd PSU

Try the paperclip test on both PSUs

This is done so that the PSU can be started disconnected from the motherboard and you can test ALL the voltage outputs supplied on the PSU leads to see if they are OK or not.

의

So if both PSU’s don’t work, then can I get a second PSU for the second motherboard without it breaking? Also, what would have caused the first motherboard to break the PSU’s?

의

*update* I tried the paper clip test on both PSUs and the fans spun. So I’m guessing the PSU’s are ok. So did I break both motherboards?

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Hi @random_user_101 ,

It wasn't a case of making sure that the fans were spinning in the PSUs, you have to use a Voltmeter and check that all the voltages supplied to the motherboard by the cable that you put the paperclip into are there and are of the correct value e.g. the +12V might be OK but the +3.3V or +5V might not be there or are not the correct value.

Place the Voltmeter probes between a ground pin on the connector cable e.g. pin 17, 18 or 19 etc and the other probe on all the other pins with voltage on them and check the value is correct or even there.

Check both PSUs and see if they have the same problem

Something has got to be wrong if both PSUs won't fire up 2 different motherboards, at least enough to fail POST etc..

You might not have broken the 2nd motherboard if the 2nd PSU was made faulty from the first motherboard it may hopefully be that it just can't start the 2nd motherboard now.

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To make sure that there is not a short circuit unplug everything from the motherboard, including add-in cards, but not new power supply - make sure the ATX_12V is connected as well the main ATX power connector.

  • video card
  • modems
  • network cards
  • All drives - hard drive, CD/DVD drives and floppy.
  • etc. take them all out.
  • How many RAM chips? If two try taking one out at a time. Sometimes unseating and reseating will fix a bad contact.

Also shake the case to see if there is a loose screw some where causing a short circuit.

So now you should have the monitor plugged in, the keyboard and the power supply that is it!

We are trying to eliminate possible causes of our problem.

O.K. now try turning it on. Does anything appear on the screen? Are the fans spinning?

If yes to both go into BIOS and set to defaults.

Then try adding the hard drive with Windows on it. Did it boot up?

Let me know how it goes.

In 35 years I come across maybe about 5 motherboards that had a natural death. Quite rare, well apart from some one spilling liquid on it or the like.

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