after the /release, it just sits there looking for a DHCP server, can't
find one and times out. Doing a ping to 192.168.0.1, the DHCP server,
I get a host not reachable. Pinging another host on the net I get the same thing.
It's suddenly just not talking to the network.
O.K., so we have to get even more basic. Double check your cables and
your connectors. Is your hub/switch lighting up the proper port to show
that it recognizes that your machine is connected to it? Does your network
card on the machine have indicator lights that show it recognizes the cable
plugged in? Try unplugging and replugging the cable on both ends to make
sure the connection is secure.
Then try the IPCONFIG /renew again and see if you can ping your DHCP server.
You might also try to reload the drivers for your NIC if you haven't already.
Next thing to try would be to completely uninstall your network card (physically
too, if it's not integrated onto the motherboard) and then reinstall it.
If after all that it still doesn't see the network I would try to swap
in a different network card (NIC) and see if that card works -- it's possible
that your NIC has actually failed. If it's integrated onto the motherboard
that will be difficult to replace - is the machine still under warranty?