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You can try a reset of the console (which will erase all stored data, be warned):
Hold down 2 buttons together, the PAUSE/END button and the left-hand ^ (up-arrow),
Press ENTER (the center / START button)
Press ENTER a second time
and hold down the 2 buttons together again,
then the screen should say 'RESET CONSOLE?'
and you should press ENTER and it should say ARE YOU SURE?
then press left-hand up-arrow to select YES,
then press ENTER. And after a little, the initial screen of the console should show up.