Safari Issues

Over the past couple of days I have been having more and more issues with Safari. It started when trying to access Facebook and I recieved an error message saying cant connect to server. After searching for possible solutions I reset Safari but that seems to have made the problem worse and I am not unable to acces Google or googlemail without getting the same error message.

To try and get round the problem I downloaded firefox and the same is still happening. I can access the sites on my phone and ipad so I know its not an issue with my network etc.

Any suggestions would be most welcome