HT204267: If your Mac won't turn on
Learn about If your Mac won't turn on
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Helpful answers
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Sep 7, 2015 10:51 AM in response to wendy99911by rkaufmann87,First attempt to reset the PRAM 2x, instructions are in Intel iMac SMC and PRAM resets.
If that does not work, then restart the computer in the Recovery Partition by holding down Command + R and open Disk Utility and Verify the HD at least 2-3 times, then Repair the HD 2-3 times and if errors appear after the 2-3rd pass, the HD is damaged and needs to be replaced.