I flashed new Raspbian Stretch Lite onto SD card on laptop, connected HDMI monitor and tried to boot the Pi 3B+.
First I saw 4 raspberries, without the normal boot messages, then it repeated.
Sometimes the full screen color picture appeared, but then it rebooted again.
I read that Pi 3B+ needs 5V and 2.5A.
I had connected it to a 7 port USB hub as only device.
Its power adapter states:
Is power adapter big enough?
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INPUT: AC100V-240V 50/60Hz OUTPUT: DC5V === 2.5A and then some symbols like CE, ROHS, ...
Is USB hub an issue?
I can power all other PIs from that USB hub, Zero, ZeroW, 2B, 3B, even more than one ...
Finally I did what I would not have awaited to work, connect USB cable to laptop, and Pi 3B+ booted like a charme.