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Hi,
Did you reset the MST Hub? There is a button on the back.
Check if you have applied the latest updates
Check this faq from Microsoft
The number of external screens that your Surface Pro 2, Surface Pro 3, or Surface 3 will support depends on your settings for refresh rate and resolution, and on whether the display on your Surface is on or off. For Surface Pro 3, it also depends on which processor you have (i7, i5, or i3).
Surface
|
Surface display
|
External displays
|
Refresh rate
|
Screen resolution
|
Surface 3
|
On
|
One
|
30 Hz
|
3840 x 2160
|
Surface 3
|
On
|
One
|
60 Hz
|
2560 x 1600
|
Surface Pro 2, or Surface Pro 3 with any processor
|
On
|
One
|
60 Hz
|
Up to 3840 x 2160
|
Surface Pro 2, or Surface Pro 3 with any processor
|
On
|
One
|
24 Hz
|
Up to 4096 x 2160
|
Surface Pro 2, or Surface Pro 3 with i7 or i5 processor
|
On
|
Two
|
60 Hz
|
Up to 2560 x 1440
|
Surface Pro 2, or Surface Pro 3 with i7 or i5 processor
|
On
|
Two
|
30 Hz
|
Up to 3840 x 2160
|
Surface Pro 2, or Surface Pro 3 with i7 or i5 processor
|
Off
|
Three
|
60 Hz
|
Up to 1920 x 1200
|
Surface Pro 3 with i3 processor
|
On
|
Two
|
60 Hz
|
Up to 1920 x 1200
|
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