It will work, but you'll need a new operating system. The original windows is for dell boards only. But first reset your dell bios by removing the board battery for one minute with the power supply unplugged. Then try posting.
Ok. If it helps, I was told that a message had come up about a USB power surge on the printers USB port, and sure enough I couldnt print. I swapped the USB around, and then this happened. Not the first time its done this, but Normally it is possible to get it to boot (have tried the battery and CMOS clear before, but will try again)
If you're worried, then post this question on dell's forum on their website. You may find another used dell board that will fit your case and let you keep your operating system intact.
You may also get this case for only $40 more; it will work with nearly all motherboards: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Damn newegg links don't work sometimes. Checkout their rosewill micro atx cases if you just want to use micro atx motheroards. If you like full size atx boards, go with the antec. It's much better quality and the best deal out there.