Not much to go on here...
What does the Device Manager entry for the NIC chip now say? It should be a problem device if it is not working.
Did you try clearing the BIOS to get the NIC chip working again?
You could try this, connect the CF card reader and the IDE ODD too, and start the PC. Go into Device Manager and open the entry for each of these devices, including the NIC. Click on the Resources tab for each device, and see if there are any conflicts. If not, you should see "No conflicts".
You can also create a System Health Report, from Control Panel, Performance Information and Tools, Advanced Tools, at the bottom of the list.