I've had two mechanical issues with DSes. My left shoulder button no longer responds. I've purchased another button but have yet to desolder the old and solder the new. My girlfriend's DS stopped turning on and I cracked it open to find that a capacitor had come loose. I soldered that back on, restoring functionality to her DS, but in the process of disassembling and reassemlbing her DS, I managed to break one of the pins in her video ribbon cable so her top screen is nothing but vertical lines. She accuses me of breaking her DS, but as it is less broken than when I was given it, I insist that I modded it.