Are you using a flatscreen monitor or a VGA monitor?
VGA monitors will produce hum to the speakers if they're near by.
There's probably a gazillion other possibilites, so we'll just start with this one and move on one by one from there.
get comfy, this might take awhile.

It is one of the big fat monitors AND the speakers are very close to the monitor.. but how does that produce noise and hum on my recordings?

The VGA type monitors create a big magnetic field. The recording would be fine, it's just that the speakers don't like being in a magnetic field. (they have their own magnetic field that they like to work in and don't take kindly to other magnetic devices getting all up in their stuff)
Move the computer monitor away from the speakers and tell us if things improve.

Alright, I'll try this. Thank you!

Simpler way to do it: shut off the monitor. :-)

Mihai Toma

what kind of surge protector are you using? I was having the same trouble you were, and i tried everything from moving speakers around, disconnecting rack units and preamps, changing cables, and buying de-hummig devices. I had everything running on a furman power conditioner, and my monitors, computer, and furman were connected into an old "industrial" surge protector I swiped from work. My choices, because I was facing a budget crisis at the moment, were either wait to buy a new furman, or use my surge protector that was once used for my home entertainment system. (It was pretty expensive when I bought it, but i needed more outlets) This not only did the trick, but it completly got rid of all electric hum. But despite me trying to sell these surge protectors, I'd still get a furman power conditioner, because it is less clutter.

Tell me that you didn't just say that you stole something from work?

The VGA type monitors create a big magnetic field. The recording would be fine, it's just that the speakers don't like being in a magnetic field. (they have their own magnetic field that they like to work in and don't take kindly to other magnetic devices getting all up in their stuff)
Move the computer monitor away from the speakers and tell us if things improve.

Thats the funnest way of saying it I have read yet!
Nice!

Basically, look up speaker shielding.

Space wrote: Tell me that you didn't just say that you stole something from work?

Old Saying wrote: On the internet, no one knows you're a dog.

New Saying wrote: On the internet, if you tell someone you are a dog then everyone will know it forever and will have documented proof of your admission

Another point is that on the internet it's hard to know when someone is joking.

I thought I was living proof?