Dell was able to help (thanks Dell) and it is booting now after bios recovery and clock reset.  (see below) The recovery was odd as it showed no progress / blank screen for both processes but after walking away and coming back 5-10 minutes later it restarted. Working on random middle of night / long sleep reboot issue now.   ====================================================================== 2) Perform Real Time Clock (RTC) Reset 
When I hit the power button the keyboard lights up and nothing else happens (black/blank screen) If I hit power again (even holding down for 35 seconds) the keyboard light goes of and nothing else happens. If I power up with the D button pressed it does go through the white/colors cycle but still does not boot or do anything after. Help??
Inspiron 16 plus 7620 power button then keyboard lights but blank screen