firstly, both leds were lit on the chip 3.3v and 5v when in the v1.6b crystal xbox. major problem with 1.6b version xbox (has hynix ram). when chip installed black screen appeared and not the flash bios screen. i then put the chip in another xbox v1.4 and flashbios screen appeared. flashed with bios 3.03 and then 1959 and all appeared well. however when the flashed chip was put back in the crystal 1.6b all i get is a black screen, but xbox works perfectly when chip disabled. i have checked the solder points over and over. i suspect a software problem or a bank problem?? any ideas will be appreciated