Hi Chris, I met this case twice. First time , I didn't update firmwear.  I only changed  iDrac setting and back it  to default. But this mother board  got out of order soon. So this may be one of reasons.Next time this menu disappeared ,  I update iDrac version 1.66 to 2.10.10.  So your point  is right. Thank you.
Hi! Please help me! When I set iDRAC on R820 , first time I found the setting menu but next time I can't find it. The setting menu is "Power Supply Capacity Alert :Enabled or Disabled".  Why the menu does not show? And How can I set this again?
iDRAC7 Power Configuration setting