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While holding the power button, plug in the power cord of your iMac. The master port is the USB-C port next to the Ethernet Port.
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You may need to update to the latest macOS to run the app.
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If the T2 chip is not functional, it won’t respond to the power button and your iMac won’t power on. Starting in 2018, Apple integrated the SMC chip to a larger multifunctional chip called Apple T2 security chip in the new Macs.