The safest solution is to purchase a new RF Board, but there is a more immediate solution available

Capacitor C57 on the RF Board frequently shorts out causing the entire board to fail, but it is not strictly necessary for the board to function. You can either desolder the capacitor or pop it off with a screwdriver. Just be careful not to damage any other capacitors

Note: the buttons on the board still may not work, the console may occasionally make eject or power sounds, but it will function with a wireless controller and turn on/off accordingly.

EMBEDONIX has a video more carefully describing this process, linked here.