Having trouble with Steam, and the website support hasn't given me much help.

Tried to open Steam today, it updated - and finished the update as far as I know.

But when it tries to connect, it will say its connecting to my account but doesn't do anything else.

And then it will say Steam (Not Responding) in the bar.   

I have double checked my firewall, and have re-allowed permissions for steam.

So... I have no idea what to do, everything is the same as it was last time I used it - except the update, but I checked and the update was for things relating to a bug in a game Steam sells.

Any advice?? :P