My advice would be find out if it's noise pre-recording or post - you don't wanna cut noise with EQ inside the computer when the noise could easily be fixed out side. From what you said at first though, it sounds like it may be pre-recording.
Try this (although you probably have already)..
1. Balance the mixer levels so the main mixer, control room and independant channels. If you have the indepentant channels too quiet and the main mixer too loud to compensate, adjust so they are all below their max levels.
2. Move your PCI cards around. If possible, try to nothing sitting next to your sound card.
3. Move sound cables around so none of them over lap power cables too much - cable quality (not length) can make a difference here.
4. If you are using pre-amps on the desk to boost signal, I'd advise against using them too much (unless you have a really nice desk - wish I had more money).
Hope you get rid of it. It's not goodd recording noise at all.
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