. Boot up your 21.5" iMac 2. Insert the OS X disk ( the one that came with your 21.5" iMac) 3. Restart your iMac 4. Hold down the C key immediately, and keep it pressed until your iMac boots from the DVD. Do Step 4 again - instead, hold" /> Mac Forums - View Single Post - HELP-My new iMac won't re-install OSX +
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DeanP

 
Member Since: Jul 16, 2011
Location: Auckland, NZ
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1. Boot up your 21.5" iMac
2. Insert the OS X disk (the one that came with your 21.5" iMac)
3. Restart your iMac
4. Hold down the C key immediately, and keep it pressed until your iMac boots from the DVD.

Do Step 4 again - instead, hold down the Option Key.
QUOTE Thanks