Computer Does Not POST After Deleting Microsoft Corporation UEFI CA 2011 in BIOS

Affected Platforms:

• XPS 8950
• XPS 8960

If the Microsoft Corporation UEFI CA 2011 is deleted or all the keys are deleted, the computer displays a black screen during POST with a three yellow and two white LED error code when the monitor is attached to the discrete card port.

There are two possible operations that may cause the issue:

Operation 1:

1. Enter the BIOS setup menu
2. Select Security
3. Set Secure Boot to Enable
4. Set Custom Mode to Enabled
5. Set Microsoft UEFI CA to Enable
6. Click Db > Delete
7. Save and reset
    

Operation 2:

1. Enter the BIOS setup menu
2. Select Security
3. Set Secure Boot to Enable
4. Set Custom Mode to Enabled
5. Set Microsoft UEFI CA to Disable
6. Click Deleted All Keys
7. Click Yes
8. Save and reset
    

The deletion of the Microsoft Corporation UEFI CA 2011 causes the computer to display a black screen when the monitor cable is plugged into the discrete port, but it displays normally when plugged into the UMA port.

Follow the steps below to recovery:

1. Switch Monitor input port from discrete port to UMA.
2. Enter the BIOS setup menu
   1. Select Security
   2. Set Secure Boot to Enable
   3. Set Custom Mode to Enabled
   4. Set Microsoft UEFI CA to Disable
   5. Click Reset All Keys
   6. Click Yes
   7. Save and reset
       
3. The computer does not display a black screen on the UMA port.
4. Switch Monitor input port from UMA to GFX.
5. The computer does not display a black screen on the GFX port.