I buy up things and bought up a DSi that had that same problem. I had in the past watched a video about unexplained errors and it said to touch the very upper Left hand corner when you start up the game (the screen at start up). So I tried it and it took me to a menu for set up. Then there was a rest all and that is what I did and a couple seconds later it was ready for set up like it was new. The bad part about this is if you had games you bought and installed you will loose them. 2 days later it is still working just fine. Hope this helps! It worked for me .