I found the problem! It wasnt the super gameboy at all, it was just the video input on my tv.  I just changed to the coaxial cable and rf switch and it works fine.

His Super Gameboy is like a bicycle...

oh baby

Could use a cleaning? These things are pretty old and sounds like from the way you described it "a fairly used Super Gameboy" could be dirty on the inside.

Well, thanks for the input. I'll just hope it fixes itself.  But even with Metroid II: Return of Samus, it goes all flickery and shakes. Any ideas?

Could be your Super Gameboy not recognizing the cart. I've had weird issues with Super Gameboy using an EMS cart but after a quick reset or re-cart-insertion it fixes itself.

I have a fairly used Super Gameboy system that I use often for lsdj (when i feel like making music on a larger screen), and all of a sudden a few days ago whenever I put in any gameboy cartridge the super gameboy would start up as normal, and then when the game tried to load, the whole screen shakes and flickers. any ideas?  I would open it up but im not gutsy enough to try the bic pen trick and i dont have one of those special screwdrivers.