Bose Radio PLS help

[frgarcia]

OK i have a 2002 pathfinder with bose 6 disc changer, enough said. the radio began not responding in cold weather this winter until the vehicle ran for about 5 mins or so. then the radio screen would not light up and would not turn on, but i could hear the changer making noise when i plugged in the harness in the back. radio fuse is good, amp fuse is good. Went to the junkyard today, my friend let me try a non bose radio from a altima, plugged it in, lit up no problem, all functions seemed to work except no sound. now the plugs are the same so i figgured that a non bose with high level speaker outputs would still produce noise through the amp even if it was not pleasant. i left my testlight at work, cannnot check for power, but amp fuse is good. are the known amplifier problems i should know about possibly? Please any help would be greatly appreciated, if it were a GM vehicle i'd be fine, but im not much of a nissan tech.