I have a Rev. A g5 iMac that I installed an airport card in a couple months ago. Everything was working fine at first....then the signal would get weak every now and then or completely drop out. As of Sunday it can't get a signal at all. I've opened up the iMac and checked the connection with the card and everything looks OK, so I'm not sure what the problem is. I'm able to use my macbook and get a signal from our router with no problems. I'm getting a full signal downstairs and both the router and iMac are upstairs. A friend was also over last nite with her PC laptop and had no trouble getting a signal. Any ideas on what the problem could be? It's pretty frustrating b/c I have no idea what's wrong! Thanks for any help, allison.