Enableing a disabled onboard NIC??

Hello!

I have a donated lot of PC’s that have NIC’s installed in them and onboard P10 NIC’s. I am trying to remove all of the NIC’s and use the onboard ones only. The problem is they have all been disabled and I can’t find where to enable them. No obvious jumpers and nothing in BIOS. The machines are all Aquanta DL series 2. If it helps, the only serial number I can find is CWP 50034. My whole crew is stumped………
Any help??? Thanxs a bunch!