Hacking Pressed cheats, certain ROMs don't work

[MakerNekoMizuki]

Well out of curiosity I pressed cheats on a couple of games just to see what cheats they could even have, well... they didn't, and now those games that said "No cheats found in db" I tried just give a white screen when I try to play them, I took the games off the cart and put them back on, I tried replacing the cheat file, but they still don't work, all the other games I have work except for the ones that I did that on... how do I fix this?

EDIT: Acekard2i, I updated the firmware like a month ago so it has the newest firmware from the time

 

[Rydian]

Try replacing them with clean ROMS. If that doesn't work, try replacing a game that does work, and if it stops working after that, something's wrong with your microsd or the reader.

 

[Another World]

did the cheat engine generate .cc files for those games? if so delete them and then try to load the games again. also, try turning off cheats on a per-rom basis for those games.

if all else fails do as rydian suggested...

[ft]panasonic sd formatter[/ft]

-another world

 

[MakerNekoMizuki]

did the cheat engine generate .cc files for those games?

That's kind of what I want to know, I'm not sure where it would have saved those...