HT201295: Reset the System Management Controller (SMC) on your Mac
Learn about Reset the System Management Controller (SMC) on your Mac
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Helpful answers
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Mar 6, 2016 11:09 AM in response to Neilemby judysings,Hi Neilem,
I understand you are having trouble getting your iMac to start up. Your profile doesn't indicate what operating system you are using? Have you recently updated your software or made other changes to your system? The resources below will provide some initial information and troubleshooting steps to figure out what is happening with your iMac. If you are not able to start the computer up normally, then a Safe Boot may be a good initial step to try. A wired keyboard and mouse will help you get past any bluetooth issues you may be having. Please reply back after attempting these steps if the issue persists with any additional information, including error messages you see so that we can delve into this a little further for you.
About the screens you see when your Mac starts up
OS X El Capitan: Start up in safe mode
Take care,
