on my modchip there is a switch on mine if there is a switch on the mod chip try to switch it to a different position. if you can get good HD pictures of inside your xbox motherboard and mod chip that would help.
also check the solder points on the chip mine kind of what his did in the video once and it came down to the solder points on the chip needed to be re soldered
also check this thread out might help you http://fileforums.com/showthread.php?t=47605
image 7 those look like some bad solder points
looks way better then before. tell me how that goes
Pictures of redone points, press picture for more.
This is what I found after popping "guarantee sticker" of this console. I redone these points, measured with multimeter. I think I will buy solder sucker, to reposition the board, because is way offset, almost on top of test points and shifted away from LPC.