I'm working on my dad's Mac Mini (Macmini4,1, 2.4 GHz C2D) because it is suddenly having problems connecting to my wireless network. I first noticed things starting to go downhill when the power went out unexpectedly a couple of weeks ago. Since that outage, the Mac Mini began to drop the wireless network connection asking me to re-enter the WPA2 password. Once it reconnected, things would be fine for a few hours to a few days and then it would lose the connection again. Now, the problem has gotten worse. Network Preferences shows I'm connected to the network but speeds are woefully slow. When I try to ping my wireless router (Netgear WNDR3700) I'm seeing 30-75% packet loss and ping times in excess of 6000 ms for those packets that actually make it back. To rule out the router, I brought my 2009 MacBook Pro (MacBookPro5,5) into the same room as the Mac Mini and I am able to ping the router no problem with ping times in the 2-3 ms range. Is it possible the Airport card in the Mac Mini has gone bad (damaged during the power outage and progressively getting worse)? Is there anything else I should try? Any help would be greatly appreciated.