The follong message showed on the screen:
That would go on sometime up to number 400 plusconfigured
device reported invalid CHS sector 0
even from live boot stick.
Sometime it would catch on and started booting.
When I was then in my box I put it on suspend in the evening.
What I did now, I unplugged my 2 hard drives power supply
and data cables. Replugged alls again and booting is back to
normal from HD and USB sticks.
Could such a problem be caused by corrosion on the
contacts on the hard drives? I live in a climat with high
humidity and high temperature.