If you have been making periodic backups, you should be able to restore your data from those. At this point, I would suggest that you consider completely erasing your Mac, and then, install a "clean" copy of macOS using the references below. Whether or not, you want to attempt it before you talk with Apple, is up to you, but it is what I would try next. The following articles, describe this process. Most likely, if you do get a hold of Apple Support, the next thing they will try to get you to do is to have you start up your Mac in Recovery Mode to get it back to, at least, where is started before you tried upgrading it. Release the keys on hearing the startup sound for the second time. Press the power button and hold the 'Option (Alt) + Command + P +R' keys for at least 20 seconds. (Either they are missing or corrupted.) My guess, at this point in time, is was do to the upgrade not completely properly. Resetting the NVRAM or PRAM can solve the Mac wont restart after update issues, and the quick steps for the same are: Step 1. To use it, restart your device and hold down D while it boots, then youll be. After this MemTest86 will start running tests on the RAM. Macs also come with their own built-in memory tester. On your first try though, we recommend leaving all options on their default values. Solve Power Related Issues Reset SMC, NVRAM, or PRAM. Next, restart your Mac, then let it boot normally. In this mode, your Mac isolates the causes of the problem. You can press any button on the splash screen to pause the boot and configure the options first. Restart your Mac, then immediately press and hold the Shift key until some characters appear on the screen. The simplest method: hold down the Power button till your Mac shuts down. Just for information, when the startup process hangs at the progress bar, it typically indicates that required kernel extension/device drivers are not being loaded for one reason or the other. Now when you restart your computer, MemTest86 will boot from the USB. If the PC fails to boot up as before, you’ll know the RAis M modules you purchased simply aren’t. Make sure the RAM module slides completely into the slot and the retaining clips snap into the proper position to hold the RAM in place. Performing the resets, as advised, is part of a normal troubleshooting process, and something that most of us here would have suggested as well. 1 Remove the RAM that came pre-installed in your PC and install only ONE of the new RAM sticks. Ok, no doubt the installation failed to complete properly and you were left with basically a non-functioning notebook.
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