I've done some research on this and found only 1 dead thread. Anyhow, bought the console off a lady with broken screen. Says her son had dropped it and ever since it would only power on when plugged in and of course top screen was shot. I replaced the screen, found out it's on version 188.8.131.52U ( Great, don't have to downgrade ) I've checked all solder joints on the power port. Plug looks fine. Charging LED is lit up. I've swapped batteries ( from a known working system. ) Any input or anything I should look at. I've read this is how demo units act, how would I tell if it's a demo unit? I haven't found anything imprinted on the motherboard, and it looks identical to another one.