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You didn't mention what make and model you have - but this seems to be a graphics card issue. Many (HP laptops a few years ago in particular) developed "Cold" solder joints on the motherboard at the graphics card. When the computer heats up, the connection is lost, when it cools back down, the connection resumes. Usually requires a professional repair - either by attempting to "reflow" the solder, or replacing the motherboard in its entirety. Might be more cost effective to consider replacing the computer.
Huh? D-Sub is a connector? If you plug an external monitor into it the laptop is probably designed to shut of the internal screen. If this is not what you mean please get someone who can write a functional English sentence to clarify your meaning.
I ended up disposing of it.
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