sorry if this is in the wrong area, but i've been noticing lately that my front usb ports arent grounded very well. I have a line6 usb preamp for my guitar, and i get a bit of extra buzz. i touch the usb ports on the front, and the buzz goes away, so im pretti sure they're not grounded very well.
i have an old coolermaster ammo 533 case, and was looking for ideas on better grounding.