My iMac is very finnicky when connecting to my wireless router. Sometimes, it won't pick up ANY wireless networks at all, and I have to reboot the machine before it will do so. Other times, it will drop the signal, etc, for no reason. Now, I have a MacBook as well, and that holds and maintains the connection with no problems. I decided to reformat my machine the other day on the offchance that something just got installed improperly, but no joy. Any suggestions as to what may be causing this? It's driving me crazy! Thanks!