Answer Best answer as chosen by user snopuddub
Every time I've seen this
Every time I've seen this, it's the router's fault. Start by looking for any kind of firmware update for the router, and while you're there, check the wireless encryption to make sure it's at least WPA (WEP is useless). WPA2 is better, but sometimes that's too much for older routers to handle, so you could also try just dropping down to plain WPA if you have it set to WPA2.
If that doesn't resolve it, take it somewhere to get the airport card replaced. If it still doesn't seem to help, then someone will get the unenviable job of replacing the rear housing most likely, because the airport antenna cables which are part of the rear housing, seem to not be picking up signals like they should. If the rear housing is replaced, the absolute first thing you should do with the unit is make sure everything, and I mean EVERYTHING, is working. Replacing the rear housing basically means rebuilding the iMac in a new case. There are a lot of little cables that can get pinched or forgotten very easily. So if anything seems broken, the longer you wait to report it the more suspicious it will seem from the standpoint of the repair shop.
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