My mid-2011 Mac Mini server's hard disks suddenly broke due to old age so for now, I had to simply clone the whole OS disk to my new computer so I wouldn't have to panic that much. I got a refurbished Mac Pro with a 2009 motherboard, 2 x 2.4 GHz 6-core Intel Xeon, 16GB RAM and AMD Radeon HD 7950 graphics card, Yosemite 10.10.5. The model doesn't naturally have WiFi so a card was implemented, all I know about it is what system report gives, "third-party wireless card, 802.11 a/b/g/n". To make the data handling easy, for now the case contains both my old broken or nearly broken HDDs as well as the new fresh ones. The old Mini had a Bootcamp partition on one of its disks, running a 64bit Windows 7. As far as I've understood, there is no good way to clone or move a Bootcamp Windows OS to a new computer because the whole installation is so dependent on the hardware that it was installed to. However, apparently this Mac Pro boots into that old Windows installation just fine, except that the screen resolution starts with 800x600 but you can put it back to what it should be, appearing just like it was on my Mini. But obviously, I should not keep that Windows because it's on a failing disk and it was created with a different computer. So.... I have used Bootcamp assistant to partition a fresh HDD for a new Windows installation. I have used Disk Utility to format the newly created Bootcamp partition to NTFS. I have checked Apple's official documentation to make sure that I download the correct drivers for this computer. I have unzipped the driver package and placed its contents to an otherwise empty, freshly FAT-formatted USB disk. I have ALT-booted the computer from a physical Windows OS installation CD and ran the installation. But once the Windows installation reached 100%, the computer rebooted, because "your computer will restart a few times during installation". But it only boots to a black screen with a blinking white dash in the upper left corner. The computer becomes quiet and idle until I give up and have to cold reboot. I think that it's probably failing to install the Bootcamp drivers. Or, it might not know how to deal with the unconventional graphics card. The graphics card shouldn't be completely alien because the old Windows starts up and appears quite normal. This is not the iMac problem in which people report Windows booting with a completely black or distorted screen. I tried to ALT-boot to the CD again to access Windows' repair option but at this point all it gets to is a black screen with the pixelated font "press any key to boot from cd/dvd" but it doesn't respond to any keys and again, the only option is a cold reboot. I have a corded Apple keyboard. Before I blindly start playing around further, where should I actually start out? Is that Windows installation a failure for now and will I have to start over? Should I be concerned of the graphics card and somehow manually tell Bootcamp to install drivers other than what's included in the official download?