Might need to provide additional information here. Does this happen with GBA games or GB(GBC) games only? A specific game or all types across the board? I know the issue can span from dirty pins and cold solder joints on either system mobo or game cart pcb. Console mobo being the harder repair as you have to trace back and find where the issue is. Currently working on this on a unit myself and occurs only with GBA carts. Calls for the info after Nintendo Logo and stuck on the white screen, doesn't boot the game (which works on plenty of other consoles).