I've been having this problem for some time, but now I've got a new error message. Here's what I did: Out of sheer frustration, I re-formatted my hard drive and re-installed from my FC4 install disks. This gave me kernel-2.6.11-1.1369_FC4 which works fine. After testing my network connection, I typed "yum update" This took about two hours but eventually gave me kernel-2.6.14-1.1656_FC4. Rebooted. No network. But this time as the machine boots, right after starting eth0, I get the message: "Disabling IRQ #5" When I check the network status from the network configuration screen, the screen "claims" that eth0 is active. As soon as I reboot using kernel-2.6.11-1.1369_FC4, the network comes back. Any ideas?