Can't see dual monitor via HDMI on Lenovo U310

Hi All.
I try to connect second monitor (NEC MultiSync EA232WMi) via DisplayPort to my Lenovo U310 HDMI port and it didn't work. The only I can see is a black screen on NEC and nothing more. I tried Fn+F10 to select output mode and standard Windows 7 resolution settings.
Maybe I should use HDMI-DVI instead of HDMI-DisplayPort cable or need to install additional drivers?
Can anybody help with it?
Thanks in advance!

Solved this problem by using HDMI -> DVI cable connection.

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Can't see dual monitor via HDMI on Lenovo U310

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