Hi, e1000, and welcome to the forum! I'm really sorry to read about your Pioneer. Bummer if you can't get it to work again.
Have you tried resetting it? One thing that you can try is to leave it unplugged for a while and then plug it back in. You can start with about 30 seconds, and if that doesn't work (or the following doesn't), then try leaving it unplugged overnight.
You can also try doing a reset using the front panel, but that might not work if you can't get it to power on long enough. It's described on page 69 of the owner's manual. Try holding down the "Enter" button when turning the power on. The manual describes switching certain settings before doing the reset, but given your current issue and likely inability to get into the menu, I'd just try holding down the "Enter" button when turning it on. If the front panel displays "Reset <NO>", let go of "Enter" and hit the "Preset" button to toggle that to "YES" and then hit "Enter" again.