Wifi has suddenly stopped working. There is an exclamation mark which takes me to network diagnostics. This asks me for network name and password. This is different from the startup wizard which only asked for a WEP key and modem name. What to do?

My wifi has suddenly stopped working on my iMac, after working fine for almost a year. There is an exclamation mark on the wifi bars and when I click it, it takes me to a network diagnostics page. This page asks me for my username and password for the wifi, which I don't have. It is different from the WEP key and modem name, which I originally used to set up my connection. I have not experienced any problems on all my other wifi-enabled devices. Ipod touch, iPad, MacBook all work fine. What should I do?

The name is the name of the network you created on the router. The password is the WEP password. You shouldn't be using WEP at all, as it's insecure and also seems to cause connection failures. Use WPA 2 Personal. If your router doesn't support it, get a new one.

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