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Let me also share my weird bug. Back then, I was connecting my CRT TV via an S-Video cable to my PC's video card, as a secondary monitor. I noticed one day that the GPU fan is spinning slowly, even when the computer is turned off, or even weirder, when unplugged! So, the investigation began, and I concluded that when I connect the TV, the fan gets spinning.

No issues while working whatsoever, just this little quirk.

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Two weird ones I see here in the office.

I have an old HP 1440p monitor that will retain the screen image when I unplug the HDMI cable from my laptop. (My solution is to plug it into a power strip, and I just shut it off when I leave.)

There's a new Dell monitor that somehow produces a sort of halo of short vertical lines a few to several pixels long around text.

That can be fixed with a diode

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