Hi. There seem to be a problem with my iMac (Late 2008). Ever since purchased the internet connect through Wi-Fi from my router or whatever downstairs has worked perfectly. Since yesterday evening it has suddenly stopped functioning. AirPort still successfully scans for other networks, and every now and then my one appears, but when I try to connect it either says Connection Timeout or Invalid password (when I know it's correct!). Also, my iPhone and other laptop and PC are all connected and working fine, leading me to think it's something related to the Mac. I don't know. Any help is appreciated. Thanks.