welll thought i dont havent have any good experiance with AMD but to me it seems either BIOS ROM or Processor problem. reasons :

u said no activity...if everything regarding PS,cord and MoBo is OK , then the supply is in for the Processor to run, now the processor is supposed to start executing the BIOS ROM instructions.....but if nothing happens on this stage it means either the BIOS is not able to provide the required instructions or the Processor is unable to execute those or worst BOTH.

so try ur processor in someother board and may be that helps.

i can recall the days when testing a 486 processor on a MoBo i was struck on the asme problem and eventually i found the processor to be non-functional...and there wasnt any burn mark....

So i hope u will get ur BOX running up in a few days.