You can try to do a power-cycle of the esxi host. Power off the host using the physical power button, remove the power cables and all other cables from the host and leave it for couple minutes, connect back all the cables with power cables being the last in the sequence. Try to power on the Esxi host after performing these steps. If this issue happens again, I believe it is related to the drivers compatibility. If you manage to power on your esxi host, make sure you are on the latest patch to avoid any compatibility issues.