MisterFiero

I have a Corsair HX750 and I've had it for about two years now. Ever since Ive had it I've had the issue below. Scenario 1: I unplug it and plug it back in. Press the power button and it will load my BIOS but will not post. I hit the reset button and it will then it will post. Scenario 2: I plug in my external 3.5" hard drive (it has a separate power source and USB 3.0 plug) and it will either make my post time extremely slow or it will just not post unless I reset it. Hell it seems the more stuff I have plugged into it the longer it takes to post. My buddy has an AX750 and has the same exact issue. And we both have some sort of audible ground loop or EMI issue through our usb, external sound cards, onboard audio, everything. Coincidence?

A cheap 3.5mm isolator from Pyle. It's placed in between my mixer's FX Send and my computer'so microphone port.

I bought a cheap ground loop isolator and it did the trick. I am going to try to diagnose the issue further with my friend. I will bring my PC to his house to see if maybe my outlets in my house are the cause, if that isn't the case I will try his power supply with my PC. If the issue is still there I guess I'll say it's my motherboard. Is this a valid reason to RMA for Gigabyte? I'm still under warranty.

I can plug my mixer into my microphone jack and record my voice and phone audio with absolutely no EMI, but as soon as I bring my PC into my mixer and monitor/record with it through the headphone jack, I get the EMI. So my computer outputting itself is causing the issues. Also.. I actually have a sound card, I left that info out just to see if I could learn something. The EMI with the card (Audigy FX) is actually much worse than my onboard, no joke.

I use ASIO for my interface, mostly for latency reasons. It seems everything connected to my motherboard has the EMI sound.

I'm going to try plugging my mixer apparatus/2i4 into my laptop to see if I get the same issue tomorrow and will keep you guys posted, thank you guys for responding so quickly. It seems like this is a good place for help.

Gigabyte 990FXA-UD3

I bought a mixer and I am using my onboard soundcard for my mix minus setup. I have my computer volume assigned to a channel, my phone for music on another, and my mic through XLR. When monitoring my PC volume, I can sometimes hear static and electronic noise.. sometimes not. I tested the setup with my friend through Skype and he said my mic has the same sound I described. Also I've noticed when I plug in my Scarlett 2i4 through USB to record my guitar, I have the same noise. Is my motherboard not grounding properly? Will getting a soundcard help? Will getting a ground loop isolator help? It seems everything going into my motherboard gets this feedback. Thanks, hope to get some answers.