This format has is popular across all systems, including Android, Mac, Windows and iOS because of its ability to greatly minimize the file size of images. The universal and age-old format of JPEG or Joint Photographic Experts Group is a universal file format that is used for saving digital photos. What is the difference between a JPEG and HEIC file?
How to download from Google Photos in JPEG format.
Can I download from Google Photos in JPEG format?. Why are my Google Photos downloading as HEIC files?. What is the difference between a JPEG and HEIC file?. If that works, you know the problem is in third-party software that loads at boot time. That will boot your Mac with the bare minimum it needs to run and won’t load login items and launch agents. Boot in Safe mode - if nothing else works, try booting in Safe mode by holding down Shift while it boots. If that works, the problem is likely to be login items or launch agents in your main user accounts. Try another user account - if the problem occurs after you type in your password to log in, try a different user account. Try rebooting with the display switched off and turn it on during start-up. If you’re using a Mac mini or a Mac Pro or have a laptop connected to an external display with its lid closed, make sure it's not the display that’s the problem. Check the display - has your Mac failed to start up, or has it started up, but you just can’t see anything on the screen? Modern Macs don’t chime when they start up, so it can be difficult to tell. If you’re using a desktop Mac, make sure the power cable is secure. If it’s already plugged in, make sure the connection is secure at the wall and on your Mac. If you’re using a laptop, plug it into its charger. Check the power supply - this may sound ridiculously simple, but that’s why it’s at the top of the list. Here’s a checklist to follow if macOS Big Sur won’t boot. 
However, you may still run into problems, one of which might be that Big Sur fails to boot. If you’ve successfully installed macOS Big Sur, congratulations! You’ve cleared the biggest hurdle.
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