Joe, honestly man, I don't really have much help to offer you. See if you can find a guide for Slayers disc and flashing onboard bios.
If he didn't install a chip, but you have a switch, it makes me think you've got a 1.0/1.1 Xbox, so the bios you flash will have to be 512K (if you can hook the switch back up), or 1024K if you can't.
If he didn't install a chip, but you have a switch, it makes me think you've got a 1.0/1.1 Xbox, so the bios you flash will have to be 512K (if you can hook the switch back up), or 1024K if you can't.