RE: POST failed when plug in PCI-E 8X network adapter
Try this, with that card removed from x16 slot, reboot and immediately press F2 to open BIOS setup.
Look for the Primary Display option and make sure it's set it to Intel HD Graphics, not to AUTO. Save the change and exit setup. Allow PC to boot and confirm that the onboard video is working. Then power off, unplug, and press/hold power button for ~15 sec. Now install that card in the x16 slot. Close up and reboot.
If that works, keep in mind that every time BIOS is reset to the defaults, eg to clear an error when the motherboard battery is removed, you'll have to remove the add-in card, change the Primary Display option again...
If that doesn't work, you're probably out of luck using that card in the x16 slot.
Forum Member since 2004
I am not a Dell employee