iMac will not start. I hear it try but nothing shows up
What to try to get it to open
iMac Line (2012 and Later)
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1 - try starting up in Safe Mode according to Start up your Mac in safe mode - Apple Support . If successful try to reboot normally again.
If that fails continue with #2:
2 - Boot into the Recovery volume (boot with the Command + R keys held down), select Disk Utility and run First Aid on each of the volumes of your hard drive. Then try to reboot normally.
If still unsuccessful, repeat #2 except this time reinstall the system.