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Grinding sound when computer is booting

By meridenscrafts ·
When I first turn the computer on there is a loud grinding sound. Once when i took the case off the fan was really dirty. Could it be the fan does'nt come on all the time?????

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by TheChas In reply to Grinding sound when compu ...

Make SURE that the noise is NOT coming from your hard drive.

If it is coming from your hard drive, back up your data and replace the drive NOW!!!

Otherwise, YES it is likely that you have one or more fans with bad bearings.

It is a good idea to clean the vents and fans on your PC at least twice a year.

Your problem could be any of the fans (at least 2) in your PC.
It is CRITICAL that the CPU and power supply cooling fans spin up quickly and run at the proper speed.

With the power off, you should be able to easily spin either fan by hand.

If ANY fan sticks or grinds when you spin it by hand, REPLACE it.

If the noise is from the power supply fan, it is easier and safer to replace the whole power supply.

Chas

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by csmith In reply to Grinding sound when compu ...

Usually this is the fan bearings.
A hard drive failure makes more of a high pitched scream.
Replacing the power supply is the easiest solution.
Get a fan motor with ball bearings.
Ball bearings last a lot longer than the regular sleeve bearings.
Regards, Chris

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by sgt_shultz In reply to Grinding sound when compu ...

when that grinding noise happens to me, it is because a wire or cable is interfering with the fan blades on the processor usually...

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by donmars In reply to Grinding sound when compu ...

One of three things will cause the problem. Hard drive, fan or floppy. To isolate simply unplug the power to the hard drive, white plug next to ribbon cable in back of drive, then turn on computer. No noise? It's your hard drive. Noise? It's your fan. Floppy is a very low probability to cause the noise.

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by donmars In reply to

It is NOT the CPU fan. That little fan will not make that kind of noise, maybe a high pitched squeal if anything. It is also a low current device with not enough torque to overcome friction from defective bearings in order to make any noise. That fan just stops, period.

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by HereInOz In reply to Grinding sound when compu ...

Check for the cables touching the CPU fan as mentioned above, but my bet would be the CPU fan itself.

The easy way to check is to take the cover off the machine and turn it on. When the grinding begins, momentarily stop the CPU fan with a finger, (wear a glove if it is a biggie - it can hurt a little - and don't try this at home, kiddies!) and if the grinding stops, replace the fan.

Don't stop the fan for more than a moment, though, just long enough to have the noise stop (or not stop), half a second will do it. Any longer and you can start to get things a little warm with some processors.

If it is the fan, replace it ASAP. If that fan stops, or runs slow for any length of time, and things get hot, you can not only fry the CPU, but you can damage the motherboard as well. And it doesn't take very long for things to get hot, either.

Some CPU fans require the whole heatsink to be removed from the CPU, in order to replace the fan.

If that is the case, be aware that you will have to clean off all the old heat conductive compound between the heatsink and the CPU, and replace it with a high quality heatsink compound. The higher performance the CPU, the higher quality the compound needs to be.

If you are at all wary about getting to this level of the machine, then once you have identified if it is the CPU fan, take it to a reputable computer shop and get them to replace it. It will cost a little more, but it beats frying a CPU.

If it is the power supply fan, replace the power supply. It is possible to replace the fan; it is possible to service the fan, and if it is an old power supply that is difficult to get, that is an option, but if it is an ATX type power supply, just get a new one.

Don't hang about with it, though. It is important to keep all the fans on the machine spinning happily, for the health of the machine.

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