DirkT Hi there,please send us a picture of SN on the bottom of the PC.
Does the machine fail to boot even when not connected to the docking station?
Is the docking station functioning properly?
Have you tried to clear CMOS?First,please unplug the power supply and HDMI cable. Please press the pinhole of “CLR CMOS” with a pin for about 10 seconds.Ten minutes later, plug the power supply and HDMI cable, turn on the PC again. Please wait about one or two minute, if you can go to the system, Please repeatedly press delete key as soon as your restart the PC, go to BIOS. Go to Boot option, enable fast boot, press F4 to save.