Can't find any servers

I have a 10mb internet connection (Virgin Media) but when I click on refresh server list in the multiplayer menu it comes up with nothing, my firewall isn’t blocking it either, any idea why this is happening?

Odd. Try reconnecting, resetting modem or changing your ISP (Internet service provider).

It’s fixed now, the in-game server finder doesn’t work, but if you run the one on the Steam menu it finds loads, bit strange but not really a problem, thanks anyway.

Did you recently get a new computer? Try running HL2, let it load, exit out, and try the Gmod server browser again.