TRY RESEATING LCD CABLE CONNECTOR ON MOTHERBOARD Let’s narrow down the problem one by one. This could be bad connection, bad LCD cable or bad LCD screen. If only the internal screen shows bad video but external image appears to be normal (as in my example), the problem is somewhere inside the laptop display.
If both, the internal screen and external monitor (or TV) show strange or incorrect colors or any other image distortion, this is the graphics card failure.
This combination varies for different brands, for example it’s Fn+F5 for Toshiba, Fn+F4 for HP, Fn+F8 for Dell, Fn+F7 Lenovo etc… In this case you’ll have to switch video between internal and external using the Fn key and one of the F* keys in the top row of the keyboard. Other models can detect the monitor but display image only on one screen (internal or external). Some laptops detect external monitor automatically and start showing image on both screens right from startup. Most models have a VGA connector, so it would be the most common way to connect. You can connect your laptop to an external monitor using VGA cable, DVI cable, HDMI cable or S-Video cable, it depends on a type of connector you have. The main troubleshooting step is testing the video output on an external monitor (or TV). You have to know how to disassemble your computer in order to use following troubleshooting techniques. When the Light/Dark setting is changed top level windows get WM_SETTINGCHANGE message.In this post I explain some basic troubleshooting techniques in case if your screen started showing strange or incorrect colors. If ( st = ERROR_SUCCESS & type = REG_DWORD ) TEXT("Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize"), If you really want to change something in response to the Light/Dark setting switch in the classic application, get DWORD value from HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize\AppsUseLightTheme bool IsDarkThemeActive()
In the case of classic apps dark mode is problematic because basic Windows controls (buttons, labels, edit fields) do not support it. I'm not sure if you want to port Tk to UWP, because you don't seem to do any steps in this direction. You can verify that Calculator, Calendar and Contacts switch colors but classic apps Explorer, Notepad and Paint don't. Generally Dark/Light-Theme switch is intended for "modern" UWP apps only.
Update: Microsoft improves dark theme handling in newer versions of Windows 10, so in some point this answer will be outdated.
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