If you are getting no video on VGA port (out of box, after motherboard replacement, clearing NVRAM, remove CMOS) in general, be sure to check this setting while troubleshooting.
PowerEdge - No Video on Local VGA Port
Duration: 00:01:37 (hh:mm:ss)
When available, closed caption (subtitles) language settings can be chosen using the CC icon on this video player.
The
iDRAC Virtual Console displays video without problem.
This could happen if the Local server video is disabled on the
Virtual Console settings.
Ensure that the Local Server Video is enabled on the
iDRAC Virtual Console Settings:
IDRAC 7 and 8
IDRAC 9