Hello Martin Verkerk,
Thanks for the strange idea. Worked perfect.
Kind Regards,
Karl Azoms
HP did not find another solution.
Maybe only a replacement of the motherboard.
What I tried and what was very strange: I replaced the CMOS battery and the failure was gone!
I dont understand that because you won't espect that when the power is on that it can go wrong (or there is a failure with the mother board).
For now: thanks a lot for your input!
Kind regards,
Martin Verkerk