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Buzzing/humming noise in my computer's power supply

I have a power supply (550w max output) that started humming/buzzing this week. It is not very old, I only bought it a few months ago when the first one went out. I leave my computer on all the time, so I'm not sure if maybe I'm not supposed to do that and I've overworked it, or if something is just going wrong in it. Yesterday, I took it out and cleaned it with that air-in-a-can for cleaning electronics and it stopped for a little while, but it's buzzing just as loudly again today. Sometimes it even starts to sound like it's going to go off, then it'll rev back up and buzz steadily again.

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Most power supplies come with a one year warranty. Contact the manufacture for a replacement.
Make sure the power supply is mounted snuggly & it's not vibrating.

Mike

Posted on May 06, 2008

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I wouldn't recommend leaving your PC on all the time but don't think this should have harmed your new power supply. The power supply may be faulty so try speaking to the store you bought it in to try another one. Alternatively, I would try moving your PC to a very well ventilated area at your desk to see if this helps.

Posted on May 06, 2008

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Katherine,

Many times when a desktop is making a strange buzzing noise - it is due to a fan malfunction of some sort. Other reasons include a power supply that is faulty or possibly a bad internal speaker.

I would first check the fan(s) for the computer. Start by turning the computer off all of the way. Next, unplug the cords from the unit. You'll need to isolate just the computer tower itself. Next, you'll want to get some compressed air or a vaccuum and gently clean out the areas where the system case fan vents are. If you know how to open the case for your desktop, it wouldn't be a bad idea to make a quick visual check inside of the case for things that may be caught in the fans. Some desktops open via screws on the back plane, and some open with a pull tab/lever.

If cleaning out the dust doesn't resolve the buzzing noise - then you'll need to make sure that the noise is not part of the electronics. If you are hearing an actual electrical buzz and not a speaker or fan noise, then there is likely a larger problem with the computer. In that case - I would take the computer to a certified professional for diagnosis.

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Ideally there will be some amount of noise emanating from any system, so its normal. The noise factor can be attributed to various components within your tower. Typical components that generate noise are:

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