Step 1: Shut down your Mac computer and wait for 10 seconds. Here are how to boot your Mac device into Safe Mode: You can also give booting your Mac in Safe Mode a shot, which rules out all incompatible software and repairs some errors when the Mac login window gives no response. If it's a T2-based Mac, you'll see the Apple logo appears and disappears twice instead.
Step 3: Release the key combination when you hear the second startup sound from your Mac. Step 2: Press the power button and simultaneously hold down the Option + Command + P + R keys for about 20 seconds. Provided that you have no sureness of whether you have reset NVRAM/PRAM or not, this post explains to you how to reset NVRAM/PRAM literally. This post will elucidate you one by one in detail and you need to be patient because the repairing process may take you some time. Based on your descriptions, the attempts, and the shots' results, I can give you three solutions: reset NVRAM/PRAM, boot your Mac in Safe Mode, and boot your Mac in Recovery Mode.
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