Re: mobo fried? cpu fried? none of the aforementioned?
sounds like a mobo problem to me.
you may have knocked something while removing the old heatsink.
they are a b!tch to unclip sometimes, and sometimes you can knock a part on the motherboard while removing.
have you got a old mobo to try the psu out with?
PENTIUM 4 3.06 GHZ WITH HT TECHNOLOGY