G4 cpu replacement not working

[geoff-h3o]

Hi; I just tried replacing my cpu in my quicksilver 733hhz with a dual 1ghz from a quicksilver 2002.
No boot, no start-up chord (which I think would show that the cpu is recognized). When I put the 733  back in everything  works fine.  Upgrades sellers sell the same cpus to fit both machines, as far as I can see. Praps the replacement is dud.
Anyone any ideas? Thanks.

[socrates]

Since the old cpu works again when you put it in, it sounds like the new one is either the wrong kind or a dud.  I'd talk to where you bought it from.