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Las Vegas

So im new to taking Gameboy apart, put in some new buttons and all ready to jam some LSDJ. I put the Gameboy back together fine, screen is clean no lines, starts well, everything looks good. Turned it on, Nintendo logo comes up so I use a Tetris cart, to test if all the sound works good and games can be played. Everything works fine. So I put in the LSDJ cart, Nintendo logo loads then... nothing. No LSDJ. The LSDJ cart working in my other DMGS but not this one, only after taking it apart. Why would the Tetris load up and work but not LSDJ? If anyone's got any idea that would be great.

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matt's mind

more-than-likely all the contacts aren't touching between the cart + gameboy.

try pulling it in and out of the gameboy a bit to dislodge whatever may be the issue or realign the cart a bit, and see if this helps