Unable to configure more than two displays while three or more are attached to the system using a PCI-Express video adapter graphics card and the Intel HD Graphics.
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The above symptom may occur on the following systems:
The system is configured with a PCI-Express video adapter graphics card.
Note: M91/p Eco Ultra-Small Form Factor (USFF) and M92/p Tiny systems do not support PCI-Express video adapter graphic cards.
Default BIOS setting for the video Devices is [AUTO] and must be changed to [IGD] as shown below. Enable Multi-Monitor Support in BIOS Setup as shown in the picture below and then press F10 Save and Exit.
The following BIOS settings are required:
Select Active Video = IGD
Multi-Monitor Support = Enabled