My iMac (Aluminum 24") Has stopped connecting to WiFi suddenly. It was fine the other morning, and I returned from a work trip a few days later and the iMac will no longer connect to my home WiFi network. If someone could suggest some ways I can rectify this problem. What I can tell you right now, Router: Linksys WAG45GS ver. 1.1 Network Type: WPA Personal The Home WiFi network is showing up but will not connect, currently showing strength of 2 bars. I have tried various ways to reconnect to the WiFi but to no avail, namely: - Turning the router off and back on again. - Deleting the saved network setting that was currently set-up and creating a new one. - Via 'Network Diagnostics' it begins 'scanning' and kicks off the networks listed via the 'Airport Status' on the desktop and refreshes a few moments later, I am able to select the network where I am prompted for the password. I enter the password and receive this message instantly "This computer was unable to join the AirPort Network you selected. You may have entered an incorrect password or network name, chose the wrong type of wireless security (*which it hasn't even asked me to disclose*), or you may be out of range from you base station...." My flatmate can connect on his laptop fine, and both my laptop (Which I am typing on now, and my iPhone can connect to the same WiFi network.) Sometimes the network will appear in 'Network Name' in the 'Network Preferences' area and disappear again, have also just received a 'No Internet Connection' sign as the status, (grey bars with black exclaimation mark.) And there was a brief message in the 'Network Preferences' that is had reassigned the IP address and changed to 'Self-Assigned' but this quickly vanished with no change to connection. Finally, I have listed the network once again under 'Preferred Networks' but although listed does not connect. Could it be IP related? Any suggestions/help would be greatly appreciated, its now 3am and meant to be my birthday!