My marantz sr5200 powered off and won't turn back on. What do I do? There is a light flashing red. this is not an overheating problem or fuse problem. It happened when I was trying to program the multi-zone feature.

Try to reset the memory circuits, the info on them may be corrupted, try this:
1 disconnect the plug from the AC line supply
2 wait 10 minutes then, reconnect the plug to the AC
outlet
3 try to operate the equipment.

now.. if above does not work you may have to contact the manufacturer as
the issue could be related with the internal circuitry.

good luck!

You might not have to reset it, try checking ur fuses, it could have tripped the circuit when the power went out.

Normaly that's what happens unless it was a direct contact then, u might wanna go get another receiver, and what i mean by direct contact, i mean like directly plugged into the wall socket.

I hope that helps.

Cheers.