Hi, I was out yesterday in my 2001 QX4. Everything is working fine. I look towards my navigation system and noticed it was OFF. I hit the D/N button next to the OFF buttion to turn it on BUT nothing happened. I checked to see if my BOSS Radio that came with the QX4 was working and to my surprise, IT WAS NOT either. Both will not turn on. I've checked the fuses under the hood and all seems to be working. None are blown. I unscrewed the NAV and Radio and took them out to check the back for a fuse or something like that there BUT nothing. I'm at a DEAD END here. If I cannot get the NAV. working, I cannot control the A/C System. I think it may be a power issue but I'm not sure where else to check or what to do. I've checked the power on the wiring coming into the NAV. and radio. I found that some had power and some DID NOT. Not sure if that's important. PLEASE HELP! Thanks!!