Dell's mobos are NON STANDARD ATX sized boards. In addition the original PSU is 250 watt, and uses a 24 pin MOLEX AND a 16 pin MOLEX. The wires on the connector are also NON STANDARD in respect to the pin $s and what voltages they carry. Your only real solution is to buy either an 8100 mobo part # 25REH or a OPTIPLEX GX400 board part # 4H665. The only difference is the presence of on board audio on the 400 board. Both boards use APG style video cards, but in a pinch you can use a PCI card. These boards are quirky. The do not always detect the video card. Sometimes it is a matter of swapping cards until you find one that works. Also the on board nic does not always work. A nic card will solve that issue, preferably if you have the cd to go with it in case the OS cannot load the drivers. A lot of issues with these boards. These are the ONLY boards that will fit that case. As far as modding I do not think it will be possible. Not only does the STANDARD board mount differently but the access hole in the rear and the card support are probably not correct either. I speak from hard won experience! I will then offer to BIUY the empty case with PSU if you have it IF you are willing to sell it cheap and ship it to me. Reply to [email protected]. Thanks.