I am considering buying a new motherboard to put in my older hp case. However, the motherboard I want to buy (a Biostar TA790GXB) is ATX size, 12.0" by 8.8", and my current one (a K8S-LA or Salmon motherboard) is a micro-ATX 9.6" by 9.6". I have searched through manuals and postings and done everything I can think of short of opening up the computer to find out if I can fit this. Does anyone know how I can find out if this motherboard will fit or suggest any other considerations (power?, other case, etc related issues?)