A year later, same issue.
There is no CLI access anymore, so no way to run amp_enable and no way to run wd to check and see if all is well.
Also, I've let the bugger sit for over an hour with no hope. All I get, after a random amount of time following a reboot, is the attached jibberish.
Pre Q/A:
The network configuration is correct. I followed the installation guide. It's a fresh install of 8.2.5. I have tried reinstalling. The NIC is showing activity (flashing LEDs). The rest of the network cannot see the server. The IP address provided to AMP is unused anywhere else on the network. The switch it's on does not have STP. A more direct connection does not resolve the issue. The hardware is compatible, having installed CentOS 6 beforehand to test connectivity and functionality.