Hi,
Asus are now aware of this issue which is that the serial number is not programmed on your docks. As a result the device is coming up in a test mode hence the white and black pattern.
Please return these docks to Asus for a replacement stating that the serial number has not been programmed.
https://www.asus.com/support/Service...All-Countries/
Feel free to quote me if needs be.
Thanks,
James