JUst bought a gheto case from a flat mate, being a dumb as i didn't even bother looking at the case first to see what it was. Got a 145w atx PSU and some old school form factor case (y'know the one with the huge keyboard port). I've also got a micro/mini (who knows) -atx p3 mobo.. What do you reckon to my chances of running the mobo from the 145w and the rest of the junk i am throwing in there with an old 250w AT supply?