Airport connection HAS ip address but still won't connect?

Yo. Recently moved and had a net connection installed yesterday, the guy set it up and it connected fine up until last night when i decided to mess around with OSC control and had to set up my own local network to do it.

Now today I'm trying to connect to the net again back on the default 'automatic' location (i made a seperate location for the OSC to try and avoid this sort of trouble) - and although Airport is picking up the router and is saying it HAS got an IP address, the internet is still not connecting.

I've done a few common sense diagnostic checks, its not Firefox becuase I'm running Little Snitch and thats not showing any movement either..I checked that its automatically configuring using DCHP and supposedly wiped the network settings by deleting the .plist files but its still doing the same thing: reporting that it's connected and has an IP address, but still with no connectivity.

Diagnostics says it 'appears to be connected' but the Network Setup Assistant gets to the last stage of the setup and asks me to check my diagnostics because it can't connect. When seconds later it has an IP and is 'connected'.

What the hell guys.

OSX 10.5.8
Router is a Netgear VMDG280

anything else?

 

bumpity bump?