Hi I took a new USB stick and that was half of the trick.
The other problem was that my ASUS mainboard (M4A89TD PRO) had an option to use 
only 3 of the 6 cores, but with higher clock then. 

Deactivating that option ("Core Unlocker feature") in the BIOS lets
start all images without problems (I tried  Yakkety Yak 64bit, Ubuntu
16.04 64bit and Kubuntu 16.04 64 bit). Lucky me the boot problems lead
to a full BIOS reset, so that I recognized the result of this option.

Thanks for your comments.

regards,
Marcus

P.S:
Issue solved in my eyes

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https://bugs.launchpad.net/bugs/1588539

Title:
  boot from USB stick doesn't work

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