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No bootable device mac bootcamp

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I came home & restarted my computer again holding the option key, selected the Windows CD & the same error comes up! I can't imagine having 2 bad copies of Windows 7.

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So I went to the place I bought it & they gave me another copy. So then I talked to an Apple Senior Tech & he told me the Windows disc had to be damaged or no good. I click on the Windows CD & it goes to another black screen, but now up in the upper left hand corner it says CDBOOT: Couldn't find BOOTMGR. All the 2010 models were not designed to do so. It is my understanding the newer Macs do install Windows to boot using the EFI. This software assumes you have installed Windows to boot using the BIOS method. The screen comes up with the choice to pic MacHD or the Windows CD. To get all of the device drivers to work properly, you need to install the proper 'Boot Camp Support Software'. So then I read on further in the bootcamp instructions & it said if I had problems restart the computer holing the option key, which I did. But it comes up with a black screen with a flashing prompt up in the upper left corner. Then I chose the partition size, put in my Windows 7 disc, it partitioned & rebooted, and I thought it was supposed to boot up to the Windows installation. I downloaded the support software to a USB flash drive using bootcamp, and that all went fine. I'm downloading Windows 7 Professional from a disc.