lenovo z51-70 external monitor

are the Lenovo drivers install on the laptop? typically some of those buttons don't work without the hooks that some of their "special" software creates when it is install on the machine.

I would pull up the manual on that Lenovo laptop, make sure you have whatever software they sell the laptops with, and go from there. They probably have a step by step instruction somewhere.
 


only some of the drivers the cd had windows 8.1 drivers i installed 7 i found some drivers on lenovo website no idea how to get the rest
 

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