This Mac does not support Boot Camp
Mac Pro, OS X Yosemite (10.10.4)
1. Please do not post your serial number on the ASC.
2. Can you run the following steps.
a. Safe Mode - Try safe mode if your Mac doesn't finish starting up - Apple Support and try BC Assistant.
b. SMC Reset - Resetting the System Management Controller (SMC) on your Mac - Apple Support and NVRAM Reset - How to Reset NVRAM on your Mac - Apple Support and try BCA.
c. Run Disk Utility Repair and Permissions Repair and try again.
3. If you have modified BCA Info.plist, re-instate the original version.
4. You can also reinstall OS X - OS X: About OS X Recovery - Apple Support from Local Recovery (first) and test.
This Mac does not support Boot Camp