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Repair guides and support for 24" Intel iMacs by Apple.

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Computer shuts off during boot up

iMac shuts off in middle of boot up. Worked fine earlier today

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Does your Mac show any of these screens: https://support.apple.com/en-us/HT204156

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Do you still have the grey disks that came with your system? If you do one should be marked diagnostics. Using that CD restart your system with it can you enter into it?

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Annette Chin will be eternally grateful.
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