You can use the case but there are some limitations. First you have to convert the front panel ribbon to standard ATX. You'll need a standard ATX powersupply. You have to watch the rear I/O outlet configuration, not all motherboards will work without cutting the case. I had a few different motherboards in a XPS P133s case which is the same as the 4100. This configuration will fit without cutting the case:

http://www.newegg.com/app/Showimage.asp?image=13-180-029-04.JPG/13-180-029-03.JPG/13-180-029-02.JPG/13-180-029-01.JPG

Any motherboard with onboard sound with the ports horizontal will most likely need some cutting on the case. Look at this one as an example:

http://www.newegg.com/app/Showimage.asp?image=13-127-151-04.JPG/13-127-151-03.JPG/13-127-151-02.JPG/13-127-151-05.JPG

Another problem is the big heatsinks on the newer processors block the case cooling fan an interfere with air flow. Getting a powersupply with dual fans can help with this problem. There is not a lot of room in the Dell case especially with a long video card like a GeForce TI4200. It really blocks the airflow. I like these cases but they have their limitations. I wouldn't use one to build a highend computer.

thanks, the ATX P/S is no prob, ive converted Dell frount port connectors before, but my motherboard comes with a customized I/O shield that snaps in, couldnt i just snap the old one out and the new in? and yeah i can already see loads of heat problems, the P/S i have has quad fans(that helps alot versus the standard 1fan P/S), but the 80mm fan infrount of my sink is interfearing with my Athlon Processor heatsink, and im getting a 10 degree C increase because my fan cant get any air onto my sink, SO does anyone know where i can find a massive copper PASSIVE processor heatsink? My powerbutton may be broken,assuming its in its worst condition possible, are these things easy to fix?

First the powerbutton usually breaks off the front bezel where it is attached. If this is the problem, just glue it back to the front bezel. I use super glue for plastic from Home Depot. The I/O opening is smaller than standard, you may be able to remove the hard cover from the I/O shield and find that it has all the correct openings in the stainless steel piece. If not you will have to cut your I/O shield that came with the motherboard to fit.