Greetings, Here's a weird one I can't solve. I just installed an airport extreme card in my G5 PM. Network preferences says the card is active and even receives an IP address from the base station or the airport express station in our house. But when I close the side cover, the signals from either station disappear. Open the cover and they come back within 3 seconds. Close the cover and they're gone in 3 seconds. Grounding the signal? Short circuit? Grounding the wireless signal(s)? Duhhhh... I don't know. Any advice?