Dell PowerEdge R720 hung on post screen

Aungkhk,

I would start by taking the server to a Minimum to Post configuration, followed by clearing the NVRam. 

To take the server to a MIn to Post you need to remove everything from the server but the following;

• One Power Supply
• Control Panel (for power button functionality)
• Working cable connection between control panel and system board
• One Processor (CPU) in socket CPU1 (minimum for troubleshooting)
• One Memory Module (DIMM) installed in socket A1
• System Board
• Backplane (for R720xd) 

After taking the server to this configuration then locate the NVRam-CLR on the systemboard (as shown below) and move the jumper over. 

Once you move the jumper over then power the system to clear the Nvram. Once cleared then power back down and restore the jumper. 

Once the jumper is back into its original position, go ahead and power the server to see if it Posts.

Let me know what you see.

Chris,

I already done your instruction but same error. This problem means Hardware problem or not? All PSU are proper work. Do not show error at LCD panel. How can i do now? Pls help.

Aungkhk,

When under the Minimum to Post configuration, and the system still will not Post, then it is normally one of the devices in that minimum to post list that is causing the issue. If you happen to have another matching server you can move the devices listed, minus the system board, over to the other server to see if it is any of the removable devices causing the issue. If they test and function fine then the issue is likely the system board itself.