Thanks for info, lalexan! Highly appreciated!
My own problem (literally) got worse on christmas eve! More and more graphics errors appeared which I (wrongly) blamed on my graphics card. These only appeared when the monitor got hot and in the native resolution (1920x1200).
So, I performed another reflow on the 25th of December. Using more flux this time and the heat gun instead of the SMD soldering station.
Well, this time it worked perfectly! No more graphics errors PLUS the power button issue is also fixed!

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