I was just working on a track for an event tomorrow (Grok Day), with the gameboy drawing power from my computer. I leave to use the toilet, and return to find my gameboy restarting itself, but with heavily glitched graphics.

I turn it off, make sure the cartridge is firmly in place, and switch it back on.

I die inside.

There is a thick 'white' horizontal line on my screen (Inverted screen), I scream and turn it off. Tentatively, I return to it, and the horizontal line begins to fade.
Now with each turn on, the line is present, but can be masked by altering the the contrast.

Can anyone shed some light on what the hell just happened? It's been working fine the last few days since I've opened it up...