ESXi 5/6 stuck on “Relocating modules and starting up the kernel…”

 On some server (SunFire, ProLiant) after installation and/or reboot server stuck in state “Relocating modules and starting up the kernel…” 

To fix this we have to add a boot parameter to the ESXi kernel. To do this, reboot, and while ESXi is booting hit the tab key. Next add a parameter to disable the headless check “ignoreHeadless=TRUE” 

To make the ignoreHeadless=TRUE permanent for each reboot open ESXi shell (locally or via SSH) and excute: 

esxcfg-advcfg --set-kernel "TRUE" ignoreHeadless
 

Confirm by:
esxcfg-advcfg –get-kernel ignoreHeadless