See attached picture. Done all of the below steps.
Clear the system NVRAM by disconnecting all power cables, moving NVRAM jumper to clear position and power ON the system. Again, power off the system and restore the NVRAM jumper to original position. Disconnect all external devices including network cables, keyboard, USBs etc and use minimum to POST components below:
- System board
- Risers
- Processor (CPU1) with Heatsink
- Power Supply
- One stick of memory in dual in-line memory module (DIMM) slot A1
- Control Panel with cable