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Helpful answers
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May 8, 2016 9:22 AM in response to notausername7by den.thed,Make a backup.
(CCCloner, SuperDuper, Time Machine, something....)
Shutdown, check all of your power connections and reset the SMC.
as per > Reset the System Management Controller (SMC) on your Mac - Apple Support
While your at it and everything is unplugged, vacuum off the bottom grillwork to insure that your iMac is getting good air flow.
also see > How to Reset NVRAM on your Mac - Apple Support
as well as > If your Mac won't turn on - Apple Support