Thanks for chiming in: indeed I did all the usual: reset PRAM, SMC reset. In my investigation I now noticed two peculiar things: if the machine is warm, I can boot without problems, even 15 minutes later. This seems to point to a temperature issue and maybe to the paste applied when installing...
Before coming across as a noob asking: my machine has a problem, fix it for me, allow me to shortly introduce it.
My 2013 Trashcan always had some weird stuff mostly attached to graphics: once I seemed to have solved it by replacing my mouse: go figure.... Recently my graphics card got fried...
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