I encountered some issues today when installing Windows 7 on my 27″ iMac i5 via Boot Camp. Thinking that some of you may also encounter these issues, I wanted to inform you that ATI graphics drivers can be the culprit. After searching for resolutions to my “black screen” issue I found out that the ATI graphics drivers that are installed as part of the setup are often not compatible with the iMac’s card. Here is the solution from a blog I found:

1. Install and blue/black screen!
2. Re-boot but from the Win 7 install disk – seems to work if you hold alt on boot up and select the disk to boot from!
3. When you get into the Windows installer, click past the language selection. Then click “Repair your computer”.
4. Windows will scan for installations and prompt you with a list. Select your “C” drive and click Next.
5. You should be presented with a windows titled “System Recovery Options”. At the bottom of this list you should see “Command Prompt”. Select the command prompt.
6. When the console opens, you can delete the offending driver using the following command:
DEL C:WINDOWSSYSTEM32DRIVERSATI*.SYS
7. Close the command prompt window and click the Restart button. This time, boot from your hard disk. You will complete the install with no Blue screen.

Trust me, this will save you a LOT of time…

P.S. Make sure you have V3.1 of Boot Camp or download it once you have Windows up and running. This will ensure everything runs smoothly.