Hmmm. I actually switched up the video card to free up an additional PCI slot (bought a PCIe video card and took out the one that was in the PCI slot)... Had the noise before and after the switch... I did notice at one point when the noise was bad that if I would zoom in or zoom out in my DAW the noise would change.... I wish I knew more about computers... haha. I was gifted this PC from an IT friend, so theres nowhere for it to go back to. Get what you pay for I guess
Hmmm. Good to know, you could try testing another video cable on your monitor.
It is odd that the noise appears on the Firewire and USB audio interfaces. They are most often immune from noise from inside the PC. Make sure the PC is correctly earthed.
Have a poke around inside and make sure everything is seated properly too. Disconnect/reconnect all cables.
digifish