Computer Help forum


Computer makes noise like a grass clipper, What is wrong?

by Rayku6 / January 15, 2015 8:33 PM PST

When my pc has been off for a while, like 6 hours it will make a lot of noise when turned on. This noise will not stop until i turn the computer off again.


I usually keep restarting the pc until the noise doesn't appear. Plugging in and out cables seems to help before restarting it. I thought the GPU was the problem but the problem is still there after installing a new one. I suspect it could be the power supply or the heat sink.

When the noise appears the pc will still boot into windows like normal, i can access hard drives etc.
No noticeable problems using it except for the noise.

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All Answers

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Open the case,
by Ed Mead Forum moderator / January 15, 2015 9:25 PM PST

sounds like a fan needs looking after.

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(NT) I've also heard hard drives sound like that.
by Ed Mead Forum moderator / January 15, 2015 9:33 PM PST
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Heard this a million times
by Steven Haninger / January 15, 2015 9:39 PM PST

I agree with the diagnosis of a noisy fan. These make other things rattle. Too much clearance in the bushings due to wear. Sometime you can clean and lube them but any silencing of them returns eventually.

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open the case and run
by renegade600 / January 16, 2015 3:21 AM PST

you need to open the case and turn the computer on to pinpoint the noise. until you pinpoint the noise it could be just about anything from fan to possibly loose hd mount.

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Hard to hear, bit echo i think
by Rayku6 / January 16, 2015 9:58 AM PST
In reply to: open the case and run

Opened the case and tried to listen to every component. I can't really hear where the noise is coming from.


tried making a recording
first 10 seconds: CPU
10-20 seconds: Power supply
20-30 seconds: HDD

possibly even harder to hear from a recording.
Finding what part is broken here is the key. i can easily send it in and get a new one for free once i know which part.

If i cant hear what part is making the sound from this then maybe i should proceed to screw them out.

Can i screw the power supply out of the case and turn the computer on without damaging it?
the alternative would be to remove the heat sink to see if the noise disappears, but that may really screw up the processor.

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Manually stop the fans one by one
by Steven Haninger / January 17, 2015 3:38 AM PST

You'll have a CPU fan and maybe others such as case fans, one for your video card and at least one for the PS. You can also just try pressing on areas of the case to see if the sound changes. If you can find the plugs for case fans and such, just disconnect them and start the PC. You won't hurt it. I wouldn't recommend shoving a sharp or breakable object into the blades but stop them at the center center hub when doing this manually. Pencil erasers work fine. Fingers do well too if you're careful enough.

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hard drive my guess
by James Denison / January 19, 2015 6:02 AM PST

open side, use paper tube to ear and isolate what is emitting the sound.

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