Open the case and see if it needs a new fuse. A molten fuse is a good reason for doing nothing.
But it's quite well possible the device - when interrupted during the update - is in an inconsistent state now. Then it will have to be re-initialised by a Panasonic service center.
i have this system and was in the process of updating it, however my fuse box tripped and turned all the sockets off. since then the system will not power up, will not do anything at all. any suggestions??