https://m.youtube.com/watch?v=f35FCAx3Tbg
My sons dsi's top screen was white couldn't see what he was playing. I came across this video after some time of trying to figure it out and it worked!!! He can now play with it! Video doesn't explain much but I took the game out and turned the dsi off. Then I used a flash light and if you see in there there's an opening on the right side that is where you insert a tooth pick or as I did an open bobby pin lol. It will fill like you're pushing a button. After you've done that insert the game back in and turn it on voila!