Pokemon Diamond White Screen

This hasn't happened before until now.
When I load the game it becomes a white screen.
It doesn't happen for Pokemon Pearl though.
Help?

What flashcart/emulator do you use ?

i Use the R4i Ultra
not the one with v1.4 on it
Post Merge: [time]1271549533[/time]
Nevermind. It seems someone messed with my cheats and enable some which made it not work.