HT201718: How to find the serial number on your iMac
Learn about How to find the serial number on your iMac
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Helpful answers
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May 26, 2016 2:39 PM in response to Markodegardby Mike Sombrio,Try a Safe boot Try safe mode if your Mac doesn't finish starting up - Apple Support
If that doesn't help try resetting the SMC Reset the System Management Controller (SMC) on your Mac - Apple Support