Now another problem. My wi-fi reception from my Airport Express has never been good. It would drop the connection when I moved into the family room. When I upgraded the OS, it seemed to improve but lately seems about as weak as before. Now it isn't working period. It sees my network, gives it 2 out of 3 in the signal strength, but when I try to connect I receive the message "unable to join the network." The problem is not with the network. My Macbook has no problem. I have tried powering down and rebooting with no success. Any suggestions?