HT1533 How can I switch back to Mac OS X from Windows 7 Bootcamp?

I'm having problem switching back to Mac OS on my Macbook Air.  It's currently running Windows 7 bootcamp without a Mac OS installed with it.  I tried booting up on Mac OSX installer disc (Snow Leopard) on the external CDROM drive but it boots to Windows instead.  I tried the Boot Camp Control Panel on Windows and Restart to Mac OS X but it could not find an OS X intalled and I tried changing the startup disc to the installation disc on the CDROM and restarted but still goes to Windows.
Please HELP!
Thank you.

The MBA did not ship with an OS on DVD because they don't have an optical drive. There are two kinds of OS disks - commercial release, which for Snow Leopard is 10.6.3 I believe, and machine specific. If your SL disk is gray it isn't going to boot your MBA because it isn't made for the MBA. If your SL disk has a cat on it look at what specific version it is. As I said, I think it is 10.6.3 and while I wasn't able to find out what specific OS version your MBA shipped with, I'm pretty sure it was a version later than 10.6.3 and if I'm right your disk isn't going to boot the computer. You'll need to either contact Apple for a valid replacement installer or find someone with a Mac who can make a valid installer on a USB drive or DVD.

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