Performing initial setup,, system hangs during initial restart

WD Legacy Products Sentinel Products
6

To be honest, I do not know what that button does.  On the headless versions all it does is tell it to boot from a thumb drive. 

The manual says the same thing on page 12

http://www.wdc.com/wdproducts/library/?id=442&type=25&cn=4779-705105