Unable to Log On

I cannot log onto SL I get:

Unable to connect to Secondlife.
The system maybe down.
Please try again in a few minutes, or click help for help and advice and a link to system status web page.

I have re-installed the programme and still no joy. I was logged on yesterday and my hardware has not changed, nor, have any other programmes been installed since then.

I cannot even get onto the preview grid.

Any help , clues, suggestiosn would be gratefully received.

Wierd, was reading older posts, got nothing better to do obvilously, somebody had chnged login location and hey presto it worked for me. Not a elegant workaround but it did work and it does not resolve what caused this problem in the 1st place so still hoping for some Amswers Linden Family.