My iMac gets to halfway through to start and then resets

Why won't my iMac 2011 27 in. mid start. My computer froze so I force quit and when I restarted the computer I see the logo of apple and the gray screen and it gets to halfway through start up and then resets / restarts and I get the chime and continues to do this like its stuck in a loop. Cannot access the apple hardware test. I have reset the SMC and NPRAM... nothing is still stuck in this loop. Can anyone help? Im running the latest OS X El Capitan.

Try a boot sure try safe mode if your Mac does not end commissioning - Apple Support

Tags: Mac

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