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Old January 22, 2012, 01:38 AM
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Default Computer hissing noise, even when turned off

So I noticed that my computer was making a hissing sound whenever it's on. I just had watercooling set up and thought it was the pump. So I turned off the computer and paperclipped the 24 pin just to start the pump and fans. No more hissing.

I plug in the 24pin back into the motherboard and the hissing is back. But wait! Computer isn't even on. Power supply switch is on, and plugging in the 24pin immediately gives me hissing even while the computer is off. I can't believe I slept through the hissing last night when the computer was off.

Last edited by bigFOIG; January 22, 2012 at 01:57 AM.
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Old January 22, 2012, 02:27 AM
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i woulda pulled the plug lol

hissing commin from board psu or videocard ?

chek if all 24 pins making contact
chek v-card plug
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Old January 22, 2012, 02:29 AM
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I don't know to be honest... I really don't think it's the GPU. Sounds like it's the power supply or motherboard. If it were the power supply, why didn't it hiss when I ran my pump only? So that's why I think it's the motherboard somehow...
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Old January 22, 2012, 02:35 AM
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if the computer can turn on
run linx or prime
hissing might get louder or go away
or somethin might die

got dustbuster?
clean the board might be somethin on it makin contact
did ya splash any water anywhere

if its the board you gonna have to live with hissing caps
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Old January 22, 2012, 06:30 AM
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Do you have an uninterruptable power supply (UPS) or line conditioner? My Seasonic PSU makes a dreadful noise when my UPS switches to battery.

When your computer is off, the only things that are working is stuff connected to +5VSB, so that's motherboard and power supply as you already suggested. Check if there's some USB devices that are still drawing power: I know things like USB fans and "novelty" items don't obey the spec and can be on.
Unfortunately I can't offer any suggestions other than parts swapping + trial-and-error. Since you won't turn the computer on for the testing, the PSU that you use to test with could even be a 250W unit.
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Old January 22, 2012, 08:31 AM
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sounds if 5VSB has issues or coil leakage, use a hose as doctors stethoscope to locate sound
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Old January 22, 2012, 10:42 AM
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This reminds me of a serious issue a friend had. Right before one of his MoBo capacitors died he said he was hearing strange sounds......

EDIT:

By die I mean catastrophically explode and ruin his motherboard.
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Old January 23, 2012, 08:32 PM
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conformal coating can stop the noise depending on the part that's doing it and where it's located. unplug your headphones and speakers too when you test again...
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