I have a Macbook Pro and an iMac. The Macbook Pro is running on Lion, and the iMac is on Tiger. At the moment, I can get my Macbook to connect to my home Wi-Fi, but not to any of the other computers in the house, including my iMac. I've checked my system preferences and all of the connections, but every time I try to connect to the other computers, it says, "Connection failed" even when I try to click "Connect as" I get an error message "There was a problem connecting to the server 'nameofcomputer'. Check the server name or IP address, and then try again. If you continue to have problems, contact your system administrator." Any ideas on what I need to do to fix this?