Can't Get Internet In Os9 Options

[Chulio]

Hi
I have had my Mac for a while now.
I can't get an interenet connection. The light on my D-Link Router is off the cable hooked up to the Mac.
The one going to my PC upstairs is on and working.
Heres the tricky part.
I have a Dual Boot OS9 & OSX and if I boot up in OSX the light comes on and I can get on the net.
Before getting the Mac for my music I was a PC expert. The make is even easier but this one is making me look stupid.
Thanks for the help in advance.

Jimi