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I am using a Lenovo Z40 first time I upgraded to Windows 10, I left the room for an hour and came back to a blank black screen. So I tried restarting the computer which didn’t do anything. I then tried hooking up my TV to my laptop which worked. The upgrade had failed so I thought reinstalling it might fix my laptop screen. So I installed Windows 10 successfully, but my laptop screen is still black and will only work with an external monitor/TV.

Sometimes I can see the screen of my laptop flicker. Will reverting back to windows 8.1 help me?

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  • Is there a function key combo that switches to the laptop screen? For example, mine is Fn + F8 to change to an external screen and back to the laptop screen.
    – Mitch
    Aug 27, 2015 at 18:56

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Reset to default
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Similar thing happened to me for a while until I figured out that sometimes it goes to the lowest resolution screen/monitor. In my case, it was a projector (that was off). I have to physically disconnect the HDMI cable to stop it happening. So, I would suggest that you try and turn off the external monitor when restarting or upgrading.

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