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Rev

The "in case of power failure" BIOS setting is set to "Off". The power strip has a surge protection, not sure whether that is faulty as well. I have switched off "Device can wake computer" in the windows driver settings of the network card, let's see whether that helps.
– Alexander
Commented Apr 16, 2016 at 8:02
@Alexander: A surge protector won't help, that just blocks a voltage spike through the power supply. Turning a halogen lamp on or off can produce an EMF pulse that affects nearby electronics (when I turn my desklamp on my display turns itself off and on again). Your lamp and PC lack sufficient EMF shielding. I would move them further apart or improve the shielding in your PC or get a better case for your PC.
– RedGrittyBrick
Commented Apr 16, 2016 at 8:18
An EMF spike that can affect @Alexander's display like that might also produce some activity on the ethernet connection and if the computer's set to wake on network activity, that might be the issue as well.
– Steve Rindsberg
Commented Apr 18, 2016 at 14:37

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