HT1455 I tried to install windows 7 on my imac but the computer was not booting again what shall I do?

I was installing windows 7 on my imac but the installation was not completed and now I cannot boot what shall I do?

Provided you used BootCamp to do the installation, with your machine off, press and hold down the "Option" key while turning it on.  Hold the key down until you get the screen where you can select which OS to boot into.  Select OS X (you'll need to physically click the button here... tapping won't work if you have it enabled).  Once in OS X, go into System Preferences and Startup Disk.  This is where you set the default OS to boot into.  Change it to OS X.  Relaunch BootCamp Assistant to remove the failed installation of Windows.  You can try again if you wish.

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