im having problems with my dvd drive sometimes when i power on i get one red light in the lower right of the ring. when it does power on every thing works fine. once i put in a xgd3 game like battlefield 3 the screen goes black and the system locks up. i used coolshrimps jtag tool to flash my nand and i think i had the dvd toggle turned off by mistake. my xbox is a zepher running the 13599 dash. any help or suggestions would make my day thanks.