I looked up your owners manual and noted the following:
Static electricity or other external influences
may cause malfunctioning of this unit. In this
case, unplug the power cord and then plug
back in. This will usually reset the unit for
proper operation. If this does not correct the
problem, please consult your nearest Pioneer
service center.
If the unit doesn't power back up, that's probably a bad sign. Do you have your equipment on a surge protector? I have mine on two layers (whole house and at-the-plug). The outage could have included some type of surge, and that surge might have been enough to fry the Pioneer.
Just speculating though...