If your mixer won’t turn on make sure it is plugged in a regular electrical outlet. Check if the outlet is working using other device that you are confident will work. If the outlet is working, unplug the power cord and examine it for damages - damaged power cord will cause the mixer to not turn on.
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Also, check out the [https://www.ifixit.com/Wiki/KitchenAid_KHM512ER_Troubleshooting#Section_Mixer_Won_t_Turn_on|KitchenAid KHM512ER Troubleshooting Page] for more details.
If your mixer won’t turn on make sure it is plugged in a regular electrical outlet. Check if the outlet is working using other device that you are confident will work. If the outlet is working, unplug the power cord and examine it for damages - damaged power cord will cause the mixer to not turn on.