Question about Apple 24" iMac Desktop
Try booting it into single-user mode holding down Command(Apple) and S buttons when powering up. Then in terminal console, use chkdsk -fy. Use it and use it again until comes back with something like "Volume appears to be OK". Then use command: mount -uw / and then type reboot and try booting normally.
If it does not fix your problem, it's most likely a hardware issue (logic board / graphics card), and you should take it to an Apple Authorized Service Provider.
Posted on Nov 22, 2010
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Posted on Jan 02, 2017
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