I got one for free with a copy of crystal quest

When i turn it on it says "Game Boy" and underneath "Sachen (R)" but it doesn't go beyond this point. I have no idea what to do with it, i don't even know how to get into the card to see if something broke, which i considered since it goes in a little harder than a normal cart.

I'm using it with a GBA SP AGS 101

Any ideas?