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Last night I was trying to install Windows 7 on my new MacBook Air, I started it and the Windows installation began. I deleted 80GB HD (preinstalled Mac OS) also deleted, but I could install windows completely. Now my MacBook is not starting or booting from external USB DVD rom, please help me out, not even booting from the original Mac CD which came with PC.

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When you turn the Air on, does the screen come on? Does the startup chime ring? –  deiga Feb 22 '11 at 9:34
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Why you bought a MacBook when you delete the Mac OS and install Windows? You didn't use Parallels or other virtual machine, neither bootcamp? –  Arne Burmeister Feb 22 '11 at 10:40
    
honestly didn't understand too, why simply do not use os x natively and sometimes (in rare cases) you can boot parallels desktop for the Losedows. ;) –  jm666 Jun 6 '11 at 14:55

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Create an image file from install DVD using Disk Utility. Restore this image to a USB flash drive. Then start the Macbook, press and hold "option" button. you will see the start up options. Select USB drive and complete installation.

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If you have one of the brand new Macbook Airs (11" or 13") it comes with a Restore USB drive. You will have to reinstall a barebones OS X install with BootCamp Drivers to get your Win7 machine up and running. You may have to do a complete reformat in Disk Utility while booting off the USB drive and start your Win7 install over again. Apple laptops are made to run OS X primarily and Win7 secondarily. You can run Win7 all you want and only boot into OS X once to get the computer set up but you need to keep that 8GB partition for OS X on your computer.

As Faiz said, you will boot to the USB Recovery by plugging it in and holding *Option* and choosing the USB Recovery as the boot source. Installing OS X is as easy as Win7 so just follow the prompts and you'll be good.

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Actually, you normally don't need the OS X partition installed for running Windows, though I'm not sure if this is applicable to the laptops with no drives. Apples EFI handles all the BIOS -emulation for Bootcamp and thus the installed OS X doesn't do anything. –  deiga Feb 23 '11 at 5:58
    
I will defer to you, deiga, when it comes to Apple's EFI bios emulation. All I know is that my Macbook Pro installed and runs Win7 just fine and I still have OSX installed. My main question is why buy a Apple laptop if you never want to run OSX? –  Strangelikeus Feb 26 '11 at 3:52

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