Windows 10 upgrade does not detect external hdmi monitor

Hi I have just upgraded my laptop yoga 2 11 to windows 10.I use an external hdmi monitor at the office desk with the previous windows 8.1 and no problems, but once I upgraded two hours ago to windows 10I my external monitor is not detected by windows10. what should i do?? Best regards, Martin

I have ENVY 15 K101TX; and I'm facing the same problem after upgrading to WIN10.Whenever I try to shut down the Laptop, it just doesn't shutdown completely. The screen goes blank but the power light and fan stays on. I have to press & hold to shut down the laptop. And we all know it's not a solution.And it also doesn't come back after sleep mode. I have to force shut down and start it again.I have checked all the power options and have tried all the things possible.Any one?

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