What would cause a constant "humming" sound?

[CDC Mail Guy]

Not the fans, and I don't think it's the hard drives. Kind of a high pitched whine. It sounds like it might be the motherboard itself, but can't exactly pinpoint it. Mobo is MSI K8MM3-V Via Socket 754.

 

[Zepper]

Some PSUs are known to do that: please list all your system components.

.bh.

 

[CDC Mail Guy]

PSU is a 550 W Ultra x2 http://www.tigerdirect.com/applications...ils.asp?EdpNo=2974488&Sku=ULT31851%20K
AMD Sempron 3000+
cd/DVD ROM optical and 2 WD hard drives.

No video card, they just use onboard VGA.

 

[Zepper]

It is Antec PSUs that have had the noise problem. Get/borrow a mechanics stethoscope - pinpoint the source pretty quickly.

.bh.

 

[pradeep1]

I'd say the PSU would be the main culprit here. Sometimes it can be caused by a grounding fault with the motherboard. Check to see everything is seated properly, because I remember on one build, the computer would boot, but had this strange sound coming from the PSU. I pulled everything out and put it all back in making sure the mobo contacts on the standoffs were right, and the problem was solved.

 

[crimson117]

Unit 3000-21 makes a humming sound when its circuits duplicate emotions. Maybe that's it?

 

[CDC Mail Guy]

Originally posted by: crimson117
Unit 3000-21 makes a humming sound when its circuits duplicate emotions. Maybe that's it?

NOPE! That's not it

 

[acole1]

Did you check your mobo caps?