What version of OS X are you trying to install?
Is the dual processor the standard from Apple or is it a processor upgrade?

How much memory have you got installed. OS X is VERY picky about the quality of the installed RAM. Depending on how much you have installed, you may be able to remove a stick, still be within the requirements, and try the install again.
I doubt it is a HD problem. It is either RAM, Processor or Logic board. That certainly narrows it down a bit! (NOT) Happy

You are currently running OS 9.2.2, OS 9.3 was never released.

P