I have two 999 ci hd units. The one on the bow will not boot-up, it lights up,  shows the logo screen,  but locks up at that point.  I have to pull the plug in order to power down. I swapped out my other 999 and it works fine off the bow location .   I mounted the defective unit on my console,  and it would not work there either.  Any suggestions ? I  plan on calling HB tomorrow.