Gaming Pokemon Leaf Green has a white screen

[Wilfre]

Does anyone have any idea how to fix my Pokemon Leaf Green? When it starts up, a white screen will show up right after the gameboy advance logo. Though pressing L and R makes noise like pressing L and R in the ingame. I'm pretty sure it's not fake, but if needed I will provide pictures.

 

[jax604]

It would be best to post some pictures of the cartridge, then go from there, Does your other games work on that GBA? This is the first time i heard something like this happen for GBA games.