Connect the network cables and reboot your XB without any cds in it. Open your settings and check out the blue info: make a note of the IP address it's displaying. Line Status should say something as well, if it can see your PC.
Then, on the PC got to Start > Run > and put "cmd" in the box and hit OK. You'll get a DOS prompt.
Just type (without the " marks) "ping 192.168.0.2" (or whatever the XB was giving you as an IP address) and it should come back with 3 lines like this:
Reply from 192.168.0.10: bytes=32 time<10ms TTL=64
If it's coming back with "Request timed out." then there's something wrong with the network, cable, card, etc and you'll need to fix this before you have any chance of connecting.
I'm actually a noob, but when I had problems I changed the actual .ini file to my preferred static IP settings by burning another Evox boot CD and booting with this. Then when I connected, I copied the .ini over to the XB. Hope this helps...