I see where the Flash is going with this. On the R210 , the very last POST process is to initialize the Remote Access Controller and the very last message you will see on POST is to "Press Control-E ...". If a Server has no OS, or the OS is having a issue it will hang at the very point where you Server is hanging and go no further. Typically in this scenario it simply means that POST has completed and is waiting to hand-off to the OS. You can prove is disprove this theory of POST by simply attempting a boot from another device such as a bootable OS CD/DVD. However, there is another clue here, your Server is not hanging here, it is rebooting and will not process the F2 command before rebooting. This leads me believe that the issue at hand is hardware, the Server is not completing POST and the first step in troubleshooting is to take it down to minimum to POST. Remove all PCI cards including the storage card if there is one. Remove all external devices including USB keys or other peripherals. Remove all Dimms except a Dimm in the first slot. Disconnect power to the backplane and leave all drives disconnected. Attempt to POST, including striking the F2 key in an attempt to enter the Bios. If the issue continues, it is likely a issue with the motherboard. If the issue clears, start connecting devices that were removed one at a time and test POST after each device is reconnected in an attempt to narrow down the issue.
Our PE R210 is being reconfigured to be used primarily as an anti-virus server. I took it off-line, uninstalled the software no longer needed on it and restarted. Since then it is not able to get past the point where it provides the option to press Ctrl-E to enter the BMC BIOS configuration. Once the time limit for that is complete the server reboots and starts to POST from the beginning. I can press Ctrl-E and get into the BMC BIOS. I have tried changing a variety of settings including resetting it to factory defaults with no change in behavior. I have also tried clearing the NVRAM with the motherboard jumper with no change other than the BIOS settings were reset to defaults. The same for the motherboard battery. I can press F2 and the display will change to "Entering System Settings" but the server will reboot before I can access the system BIOS. Not that it matters since it never gets to the point where it can boot the OS, but it is/was running Windows Server 2008 R2. Any suggestions are much appreciated. I have included a few photos of the screen as the system POSTs. Jim [IMAGE] [IMAGE] [IMAGE] 
R210 POST reboots after BMC BIOS message