Alrighty, so I'm upgrading my hp pavilion a220n from an AMD Athlon XP 2600+ to an AMD 64 3400. I realize I need a new motherboard, and I've decided to get a socket 939 (mostly because it has four slots for ram instead of only two, so I can keep my old and add more). Anyway, my question is will I have problems fitting the new board into my current case. The case came standard with this pavilion model, and I checked hp's site for product specifications but it says nothing about case size or screws. (By the way, the current board is an nForce 2 from ASUS)I'm kind of new to upgrading and stuff, could anyone tell me if there's a possibility of fitting problems, or if all board sizes and cases are generic? If no one knows, I'll just call up tech support, but I have a bad feeling that they make these so you can't upgrade easily and instead have to buy a whole new one from them. I've already upgraded my vid card and ram and I've had no problems so far. Any help would be appreciated!!! Thanks much.