Since you can't get the motherboard to work then Aida32 won't help you. It is however, a very useful to tool to have for identifying hardware on a working machine.
There should be some lettering on your motherboard which you could type into Google to get a starting point. Motherboard numbers are often to be found between the PCI slots or sometimes on a label on the outside of the bottom PCI slot. If you can't find a number then you could start with the chipset numbers which could narrow the search down from a few thousand to a few hundred. Also the make and type of processor it takes will help to narrow down the search.