KB 78708 is a perfect example of .
This write-up is a technical summary. For production environments, always test boot mode changes in a maintenance window and confirm that your backup/recovery procedures support the chosen boot mode. kb.vmware/s/article/78708
This requires that ESXi was originally installed in Legacy/BIOS mode, not UEFI mode. If installed in UEFI mode, switching to Legacy will cause a different boot failure. In that case, reinstall ESXi in Legacy mode or use Option 2. KB 78708 is a perfect example of
When you check the logs, you see a cryptic error message: but your physical server is fine.
You check the Guest OS (Windows/Linux), and it has no idea why it shut down. It looks like a hardware failure, but your physical server is fine.