Has anyone ever upgraded the motherboard/CPU in a Compaq Deskpro 4000? I'd like to.. just don't know if it'll be possible. The one I have is running a P1 200 mhz and I'm thinking the board can only expand to what? a 266? I'm thinking more along the lines of a P2 400-500.. Also, anyone have any idea what kind of motherboard will fit? I'd open up the case and check it all out but I don't have physical access to it right this moment. thanks!