If your Mac is stuck on the startup screen then in that case, get your device rebooted after that, conduct a reset of the RAM and also reset the SMC after that shut down the Mac book then get the power adaptor connected to Mac, then on the keyboard hold the shift key along with the control key and the power button then get all the keys released at the same time, after that conduct a boot on the Mac. If you are still searching help then ask for it at Apple contact number uk.
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