computer noise through monitors???

[iamnightfall]

I've had this problem for awhile now, and its so irritating. I have my G5's audio output running into my 002 rack, the outputs then running into my presonus central station, out to my powered monitors. I've taken the central station out of the signal path, but I still hear high pitched beeping, static, all kinds of noise coming out of my monitors, when the audio from the computer is "alt source to monitor". Any help or someone with same problem??

thanks

[Park Seward]

That input is unbalanced and subject to interference from all sorts of electronic noise. Re-rout the cables. What are you monitoring on that input???