Tecra R950-10V PT530E stops booting if USB port is used

I recently bought the mentioned notebook and everything works fine.
But:
if the dynadock is connected to any USB Port the notebook stops booting after a few seconds.
The windows flag freezes ans nothing happens.
The same problem comes up if a USB Stick is connected to any USB Port of the R950.
If the DynaDock or the USB stick is attached to a different Notebook everything works.
So it must be something with the R950.
I already checked the boot device priority and and pushed the USB device to the end of the list without any result.
I hope somebody can help me.
thx in advance!

Hi
Remove the battery and the AC adaptor.
Then leave the notebook disconnected 2-3 hours.
Then additionally press and hold power button 30 sec long.
Then connect battery and AC adaptor once again
Run an check again..
Feedback would be appreciated

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Tecra R950-10V PT530E stops booting if USB port is used

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