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my 2008 imac was having hard drive problems so i switched it for a western digital 500 gb 7200 rpm and replaced it myself. after putting everything back together, when i turn on the computer the screen stays gray and later says no bootable drive insert boot disk. i then insert the mac os cd and nothing happens. ive also tried booting from the disk whie starting the computer. i was wondering if i had to pre-install the operating system on it before hand.
All help is welcomed. Thanks
All help is welcomed. Thanks