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Apple Computing Products:
macOS - Desktop Hardware
iMac won't boot up
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<blockquote data-quote="techiesteve" data-source="post: 1481472" data-attributes="member: 98520"><p>There are 2 likely possibilities, a hard drive failure, certain faults can stop you booting from a DVD or external hard drive. The other possibility, if it is an aluminium 2007 model, is the video card. Sometimes they can screw up the OS booting. If it was mine I would remove the hard drive, or at least pull off the 2 connectors, then try booting from your install DVD. If the iMac then boots as expected, you likely have a defective hard drive. If it still fails to properly boot it will be time to take it to an Apple store or AASP for a quotation.</p></blockquote><p></p>
[QUOTE="techiesteve, post: 1481472, member: 98520"] There are 2 likely possibilities, a hard drive failure, certain faults can stop you booting from a DVD or external hard drive. The other possibility, if it is an aluminium 2007 model, is the video card. Sometimes they can screw up the OS booting. If it was mine I would remove the hard drive, or at least pull off the 2 connectors, then try booting from your install DVD. If the iMac then boots as expected, you likely have a defective hard drive. If it still fails to properly boot it will be time to take it to an Apple store or AASP for a quotation. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
iMac won't boot up
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