Question External monitor doesn't work through mini display port

Jul 15, 2019
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I have a lenovo y520 laptop and a brand new benq monitor. I used a mini display port to display port cable to connect my laptop and monitor.

Everything was working fine until yesterday, I heard the "device disconnected" sound in my laptop. Now the connected and disconnected sounds keep playing continuously. I tried reinstalling drivers and it doesn't work.

When I opened settings, it shows that the monitor is recognized as display 2 but when I tried to change its advanced display options, windows said the monitor isn't active. Using HDMI works perfectly but it doesn't support 144hz, as my laptop only contains HDMI 1.4.

Also, my laptop can display on another external monitor using mini display port to display port, and my friend's laptop can display on my monitor using my mini display port to display port cable, so the problem is not the hardware.

Any help would be appreciated.

Mark
 
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