I actually just fixed it myself. When the boot screen is showing press the reset button, menu, map, and eject all at once. I did it and the system rebooted but once you can access the settings make sure your back up camera setting is turned to off. I had that setting on and that's what caused the problem...hope it works for you too! Take a look at page 136 on this manual for step by step instructions...
http://www.pioneerelectronics.com/StaticFiles/Manuals/Navigation/AVIC-F700BT_OperationManual0722.pdf
