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MAC SCREEN SAVER GOES BLACK PASSWORD
Type in your password and you're back in business. That's normal, even if you previously bypassed it. You will have to press the Enter/Return key after each one. You then need to type the following commands:
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Then, quickly press the Command and S keys, to get you into the single-user mode.) Then release these keys and start your iMac by pushing power button. Just press shift + control + option + power button at the same time for one or two seconds. Hit the Command, Option, P and R keys at the same time, right after you power it on, and wait until you hear the startup chime for the third time before letting go. If your iMac screen goes black, you can try to fix this problem by resetting System Management Controller. (I've seen someone recommend that you reset the PRAM three times before booting in the single-user mode. When it goes black, I can use the F1 and F2 keys but have to keep it on a very low settingand sometimes it won't work for. After researching, I replaced the inverter board and the inverter cable. If you did it right, you should see a whole bunch of lines on the screen in what is a Terminal-like interface. My early 2008 Macbook (White) screen has started to randomly go black when I am doing something. That's done by pressing the Command and S keys at the same time, right after pressing the power key. Next, you have to boot your Mac in single-user mode. Pressing the power key for a couple of seconds will do the trick. For example, the screensaver will run after 5 minutes, and the computer screen will turn off after 10 while the computer will go to sleep after 15. First, you need to shut down your Mac, if it's powered on. You can try to reboot or reset the PRAM and SMC - the first things that Mac users can try when something isn't working right - but that will not fix it. It is not clear what exactly is causing macOS to act up after installing an update, but it rears its ugly head after powering on the Mac.