PSU Making Very Loud Sound

[Kbeguiri]

So I just finished building my cousin's computer and I was setting up on his desk. I started to boot it up to install Windows, but it started making a horrible sound. I checked each fan and eventually traced it to the power supply. I noticed that when I put the computer in a horizontal position, the noise stops. As soon as I start to stand the computer up in a regular position, the power supply sound starts again. Can anyone help me please? Any answer is appreciated.

 

[ShadowsVoid]

This is probably coil whine. Quite common with PSU's. Get it sent back and ask for a new one

 

[GhislainG]

If the PSU is new or used and still under warranty, just RMA it; otherwise buy a new one.

 

[Steve Skills]

If it is a cheap PSU, and has no more warranty, you should change it to a new one. If it is still under warranty, you can try to replace it. You can try replacing the cooler inside the PSU, but it is a little risky if you don't know what you are doing. I have had terrible noise problems with my PSU, the fix for a short period of time was to put some lubricating oil inside the PSU cooler. That worked for about 4-5 months, then the sound came back, and I decided to change the PSU.