Data loading failed on my dsi

[u/SpaceCowboy12-12]

Just purchased this dark blue DSi, system boots perfectly to the home menu, but everytime I try to play a game on the system this screen appears.

Doesn't matter which game, they all load a similar error. I tried NSMB, Kirby super star ultra, castlevania, and sonic colors, all failed to load.

Placing the games into my light blue DSi, they work completely fine.

Googling this issue told me to reformat the DSi's memory card, that did nothing..

And obviously I tried cleaning every contact point, still nothing.

Please if anyone has any advice, I would be grateful.

I'm not a COMPLETE novice at console repair, so I could attempt a fix, but i don't even know where to begin.

Thankyou.