Running Windows 10 on my Mac Pro 1,1 64 bit with 16gb of RAM.. only problem is when i boot into the boot screen (holding alt) it is always black. i can select windows drive by knowing what arrow to use from experience but there never is a display. its always black and the monitor says there is no feed coming from the computer. anyway to change this? i was wondering before i hack into a higher operating system on the mac side. currently stuck on Lion. thanks in advance for any advice. completely understand if there is no work around.