OK seems Internet Solutions are the morons at fault.
I've learnt they suddenly, and without warning, cahnged their policy about multiple logins last week. It seems that remote access to webmail, as well as the connection the phones make to exchange are somehow seen as a seperate login. So they killed that, and killed the web access and active sync at the same time...
What has this got to do with the red light?
Well it seems the netgear modem does not let you tick PPPoE Relay (better known as bridge mode) unless you select PPPoE in the basic screen. Selecting that requires a password and username, which I entered. Hense the modem was actually making two connections at the same time, one itself and the other in the bridge mode from the server. When the idiots at IS made their changes, it only allowed one connection. The the modem directly made the connection, the light was green, but the server could not seem to access the internet seemingly because it had not initiated the connection. When I reset it, the server sometime made the connection first, and we got connection. However, the modem then tried to make it's own connection, could not, and hense gave the red light.
Anyway, have since found that you can select "no login required" on the basic screen after selection PPPoE Relay, which kills that internet light completely.
All in all, many thanks to Internet Solutions for the *** I've been through for the past 5 days...
Why did I post this under IBurst??