My Super Gameboy has run into a problem recently; regardless of their functionality, the system refuses to start a handful of my Gameboy carts. That is, it reads the "nintendo" logo fine, and begins to start them, but then just greets me with a black, white, or green screen. All of these have worked on the system literally days before, and suddenly do not. I've cleaned the contacts of both the system and games, and all of them boot instantly on my GBC and GBA, but it doesn't seem to change the outcome for the SGB. Additionally, some black cartridges in the same situation refuse to boot and show a black screen after loading up. Is there anything I can do to remedy this?

Grey carts that won't boot:
Dr. Mario
Super Mario Land
Nemesis

Black carts that won't boot:
Game N Watch Gallery 2

Thanks for any help!