I'm sure this has been discussed but I couldn't find the right search terms.   Anyway, you folks that have a 'one room' setup, how do you deal with the noise of the computer while recording? 
 
My 'so-called' studio is just swapping out a drive in my home office computer.  I generally only track vocals and I do that at the other end of the house.  It works but it's a pain.  An open mic in the office picks up way too much computer noise.  I've tried covering the computer with absorbent materials etc but it doesn't really work.  I'd really like to get set up so I could track here in the office.
 
Anyone in this situation, how do you do it?  What's your setup?  Any and all suggestions are welcome.  Thanks.
 
Paul

There are many factors that make for a noisy PC such as Fan's, CPU cooler, even case vibration.
 
Check out this place http://www.quietpc.com/casefans that might give you a start.
 
Another solution is to build a box to place your PC in this will require ventilation though otherwise your beloved PC will just so much recyclable electronics.
 

my pc is a video box too, so it is somewhat noisy, but under a table, and the difference between under and above is significant. i still hear it, but i'm able to get a decent track. or i'll set up the mic in the room next door (10' away) and use my wireless keyboard to record & stop.
 
i also have a gizmo called the kaotica eyeball. $199. http://kaoticaeyeball.com/
 
it won't filter out hammering or anything like that (lots of construction where i am) but it gives a really clean track.

You can pick up a very decent case that will cut down on noise majorly for about $60. Then you just have to transfer all your computer parts into and it's like a brand new machine! Throw in a quieter fan for another $15 and you'll have solved a tremendous amount of the noise.
 

Thanks for the suggestions guys. 
 
I have a large and very expensive case I got for my last build although it's not necessarily designed for sound dampening.  I needed it to house the AM cooler I put in.  There's supposed to by dampening material you can add to your case but I don't remember being impressed with the reviews.
 
The box surround might be a possibility although that would take up more space that I presently have. 
 
I built a gobo to record behind, (in the office), but was surprised to find that it didn't really stop any of the computer noise from finding it's way into the mic.  So back to the closet at the other end of the house.
 
Thanks.
 

Damping material on the case doesn't cut down on sound escaping through the holes in the case but it helps stop the case vibrating.

I've been building my own very quiet PCs for many years now. It requires careful selection of components, always with a view to fitting big, effective heatsinks and as few, quiet fans as possible operating on the lowest voltage possible. My current PC is no louder than background measured in a typical quiet room - around 26-30dBA at 1 metre. For recording purposes any PC noise that finds its way into a sensibly positioned mic is lost in the general background.

This inevitably costs more than an off-the-shelf PC from HP, Dell etc. and means getting familiar with PC internals, their noise levels and their power consumption. Once built a quiet PC absolutely has to be stress-tested using software to send the cpu and graphics card to 100% and holding them there for several minutes while monitoring internal temperatures to check the cooling system can cope.

The PC in my sig has only three 140mm fans running slowly at 5 volts. One intake, one output and one in the cpu cooler, no fan on the graphics card or psu. It can hold 100% of cpu pretty much indefinitely so long as I clear the vents and coolers with air duster once in a while. The loudest components are the HDDs.

Just because a manufacturer claims their cooler/fan is super-quiet doesn't mean it actually is, at least not by audio standards. I suggest www.silentpcreview.com is a good place to start research. Many if the articles are old, but the forums are very useful.

It's not cheap to do this, and it takes a lot of research and careful testing, but a fanless PC can be powerful and not cost the entire earth. The only moving parts in my PC are the hard drives, which will be getting swapped out for SSD's hopefully this year. For CPU cooling, I highly reccomend a company called NoFan. You need a big case to fit their heatsink thingy in, but it works astonishingly well.

My "solution" to this is over-simplified in a way, but effective. All audio takes I will leave a few seconds of "dead space" both before and after. For consistent background noise, a destructive noise reduction edit (I use Audition personally for this) is all that is necessary. Directional mics are highly beneficial as well.

Clean your fans.

Cleaning fans won't cut the noide down much. It's the fan motors that make the noise.