static noises coming from my speakers

[guynexdoor]

I just built my first PC, amd64 3700 w/ MSI NF4 platinum MB
I have THX Certified ADA995 ALTEC Lansing speakers 5.1 setup. It came with my old Dell.

So basically, I get a static like noise from my speakers constantly...when my mouse moves, HD is active...I get a static noise.

I tried pluggin my speakers into the front audio headphone jacks, and the noise disappears...so I know it's not the speakers.

I even put it on mute, and the static sound persists.

Is it my onboard soundcard? Are the wires in my case interferring? Are my audio connections correct? Is my video card causing static? I have EVGA 6800GT. THanks

 

[Jerm324]

Does the sound always happen, or just in the situations you described? Check the rear jack for damage and make sure the audio plug isnt coming into contact with the case.

 

[Ken90630]

You know those little EMI tabs (also called "springs") on your motherboard? Are they all touching the rear frame of the case, and thus grounding, the way they should be? Maybe the output jack from the onboard sound on your mobo isn't grounding properly, and this would be quick & easy to check. This might also explain why the noise goes away when you use the headphone jack on the front of your case.

There could be a dozen different causes for this kind of thing, but it sounds like interference or a grounding problem. You might wanna power down, disconnect the AC cord, then re-seat all your connectors & check your wiring.

You could also try removing certain components (vid card, etc.) and see if the prob goes away, then re-install them one by one until you see which one causes the prob to return.

I'm no hardware expert by any means, but just thought I'd throw my thoughts out here in case they might help. Good luck.

 

[guynexdoor]

Alright. THanks everyone. I will try those out and let you know what happens.