In our house we have 4 MACs that all have been accessing the internet (via Safari) very well over a wireless router for about 4 years. No problems with any of them.
Suddenly, one of the computers (an IMac11,2 running OS X, version 10.6.8) is almost completely unable to open web pages, download, etc. Nothing was changed on it. Am running Safari 5.1.7. The signal strength is at the maximum. The internet diagnostic under System Preferences says all is fine. A laptop in the same room has no problems.
I've done a virus scan (nothing). It made no difference when I used Firefox instead. I'm at a loss. Any suggestions?
Thanks.

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