elastic2018 was rebooted during normal maintenance, but never came back up.
console shows that it is stuck in the boot process, trying to boot over PXE and failing.
@Volans had a look at logs and found:
date=05/30/2018 time=23:32 description=POST Error: 266-Non-Volatile Memory Corruption Detected. Configuration settings restored to defaults. If enabled, Secure Boot security settings may be lost. Action: Restore desired configuration settings. Contact HP if issue persists.