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Loud Buzzing coming from PSU

post #1 of 6
Thread Starter 
Hiya guys!

Okay, so, my mother's computer is years old. It's packing some old Sempron, and about 512MB of DDR2 RAM. It's a dinosaur. I recently came over to have a look inside, and turned the PSU off in the process. I suspect that this is the first time in about two-ish years that the power supply switch has been off. It's built into the case, and I have no idea who the manufacturer is.

I dusted out the inside of the PC using a can of air (that's okay to do, right?), then closed it up and turned it on. However, when I turned it on, the power supply let out a very loud, grinding sort of whine. It seemed to change pattern slightly every now and again, and sounded like a miniature diesel truck engine.

The first time I heard it, I flipped it back off to shut the comp down immediately. However, I turned it on again later, and that time I let it stay on. It's been about six minutes, and the whine is gone. Completely. Computer's running fine, and the PSU fan is definitely spinning.

Does anybody want to help me figure out what the hell just happened? smile.gif
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Coraima
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post #2 of 6
There's only one thing that would produce a grinding noise in a psu = the fan / bearing. Since it's very old as you said, you can buy a fan and replace it yourself, or you can buy a brand new cheap power supply. Since it's such an old PSU, I'd recommend just buying an entire new unit.
post #3 of 6
That fan was all full o' crap
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The Move
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Son's Rig
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post #4 of 6
Ya, grab a cheap psu and swap it out. Probably only a 250w(or less) and should be very cheap to replace.
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MINE
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Wifes/backup rig
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My Ultimate Rig
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CPUMotherboardGraphicsRAM
2500k @4.6ghz AsRock Z68 Professional gen3 MSI Twin Frozr III 7950 1150/1575 crossfire 16gb gskill ripaws x 1600 
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2tb cavier black  Crucial M4 128gb  WD 2 tb BD RW 
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post #5 of 6
Thread Starter 
Quote:
Originally Posted by E-Peen View Post

There's only one thing that would produce a grinding noise in a psu = the fan / bearing. Since it's very old as you said, you can buy a fan and replace it yourself, or you can buy a brand new cheap power supply. Since it's such an old PSU, I'd recommend just buying an entire new unit.

Well I plan on buying an entirely new computer in the next few months here. But thanks for all the information guys! As long as my PC isn't in danger of spontaneously combusting, I think I should be okay for now.
Coraima
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Coraima
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Hard DriveHard DriveOptical DriveCooling
WD Caviar Black 1TB Crucial M4 LITEON iHAS424 Corsair H100 
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post #6 of 6
Well, a grinding PSU fan noise is usually a sign that it's on its way out. I really wouldn't take any chances with a power supply, because if the fan goes out and shorts, that entire computer can be useless, rather than just the power supply. I'd recommend just using a backup power supply for now if you have one, or not using that computer at all.
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