i have the EXACT same problem, except i dont have the original nand, i have a nand that will boot the xbox logo for 2 seconds, then get E79 1 red light error 1033. and then, if i try to make my original nand from a donor nand, i get that christmas lights. i have a xenon with a CB of 1921 also. and last, i followed this, and still get rrod. http://www.xboxhacker.org/index.php?topic=15694.0