Since i cant seem to edit my post:
I pulled the xbox apart again, and it booted with the chip again
I managed to start XBMC and everything. It was all going well, till i went into the ms dash to change the screen options (from 4:3 to 16:9). i pushed 'ok' and it just froze, screen stayed black.
I rebooted the xbox, and the LED on the chip doesn't do anything anymore
Did i fuckup somewhere? Or does this xbox just don't like chips