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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Nov 22, 2015 5:07 AM in response to jktumi6969by Mike Sombrio,Sometimes a Safe Boot can resolve the issue Try safe mode if your Mac doesn't finish starting up - Apple Support
Alternately you have at least 90 days of free telephone support and 14 days in which to return your iMac for an excahnge or refund no questions asked.