I have the xecuter 2 modchip put in my Xbox the other day and all was going well until I accidentally changed my display settings from PAL to NTSC (NTSC-J I think it was), and then restarted my Xbox

. Now all I have is sound and no display. The DVD-drive you can hear spinning and the power light flashes green. If I deactivate the modchip, I get the same problems, only this time the power light flashes green/red.
Anyone have any ideas how I can reset it back to its previous settings - is there a disc I can download etc?
Thanks