Well if you have flashed the original nand back then im stuck.
Im still betting the cpu is at fault.
think your right, probably the reason i could never get xell to run a xenon.elf it'd just there after saying it'd found xenon.elf with no usb activity.
wondering whether i've damaged a resistor on the underside of the board near cpu_bypass but again thinking if that were the case xell wouldn't even boot which it did with the coolrunner installed.
coolrunner works fine on a falcon installed it last night no problems
i'll get some pics up of my underside of the cpu see if you anyone else can spot anything