after flashing the BIOS, the ethernet port are no longer. sometimes the system freezes or resets. I clear the CMOS after flashing and set it to fail-safe, but the same problem occurs
Exactly why did you flash the BIOS to a newer version? What was wrong that you needed to update the BIOS? If you were not having a problem, then flash it back to the BIOS you had and leave it alone. If you were having a problem, did you flash the correct BIOS for your board, and is it compatible with the revision of your board?
with the older BIOS, the computer usually hangs, then reset when booting up. Rebooting the computer usually gets through this problem. The other problem is that overclocking did not show. CPU-Z mainly.
temps fine. lockups when booting due to BIOS. I updated BIOS to get rid of the problem. Rebooting after system lockups usually works. It's a minor annoyance only. But after flashing BIOS, I have no lockup problem because that's what the update fixes, but the Ethernet is not detected at all.
did not look at troubleshooting checklists. where is it?
I didn't have that problem. I had that exact same motherboard. I was forced to flash the bios to get support for a newer CPU. My ethernet port still worked fine afterwards. Make sure the ethernet is enabled in the bios, and when you are in windows, scan for new hardware from control panel. If that don't work, buy a add in PCI NIC