So, I have an M3 adapter for the GBA, which allowed me to show everyone pictures on my micro (which, incidentally, is the main thing I have been using it for. It’s just too flashy for me to withstand it, I just have to show off ;-). The M3 stopped booting about 2 months ago, but since I hadn’t been using it so often, fixing it or getting it repaired sort of slipped my mind. Well, luckily enough Stijn found this link, which explains a solution and then also what the problem could be: apparently the PCB inside the M3 can move around just enough to cease functioning :(
Well, I will definitely try this (unfortunately I have my M3 in Lux and am in Ehv atm, so I will have to wait a bit).