I picked up a Gameboy at a garage sale over the weekend for 5 bucks in very clean condition with a tetris game in it.

I played it to make sure it worked and it did so I ponied up the 5 spot and was happy.

when I took it out later to play it, I realized that the two sides of the screen aren't displaying. Its like the 10% of screen on the left and 10% of the screen all the way on the right aren't displaying anything. I didn't realize it when I was playing tetris because you don't need the sides of the screen, but when I put other gameboy games in the gameboy when I got home I realized it.

All of the carts I tested are working perfectly in my gba and gb color so I know its not a cart issue.

Any suggestions?