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Static Sound when USB Powered Device Plugged In

Last response: in Motherboards
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August 22, 2013 4:02:13 PM

I'm having a feedback sound that I can't seem to figure out. Whenever a device that is powered by USB (e.g., Capture Card, Turtle Beach headset) is plugged into any of my USB ports, there is instantly a static sound that is not in any way controlled by the audio on my PC; even when the audio is muted, the feedback remains.

Has anyone ever heard of this happening before? It does not seem to be affected by keyboard or mouse, only devices that demand more power. I suspect it to be an issue with either the wiring/grounding or the mobo itself.

Specs:

- ASRock 970 EXTREME4 AM3+ AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
- AMD Phenom II X4 965 Processor
- AMD Radeon 6850 Gfx Card

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August 22, 2013 7:40:23 PM

I have it on an Asrock H61 with an Intel 2400 and a Radeon HD 6850. I'd put it in the category of poor motherboard design. I thought it may have been the very thin cables for my case, but I put an RF choke on it and it didn't help. I also suspected the 6850 for giving off RF, but I no longer think that was the case. I could also hear the static change when writing to a flash drive (got louder) or an external HDD spinning up when first plugged in as they drew more power. I could also hear it when I scrolled a webpage (which would run the GPU a little bit and cause a static with each scroll). It is an annoying problem. I also suspected the power supply for a while, but I haven't been having any other problems related to the power supply except it used to whine or ringing at times when I put the computer sleep mode because it didn't like the low power draw (I'm using a CX430). The power supply no longer whines or rings though; it only did that when it was new.

I couldn't find a direct solution so I just use a USB sound adapter for headphones that came with my Soundblaster headphones. There isn't feedback on the back audio ports on my computer, so it's fine for me to run them to computer speakers or headphones back there.
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