Your first guess should be your Mac has run out of battery. Carefully examine the cable along its full length to see if the charger is intact and all connections are in place.
Also, check the AC power socket is working. To isolate the source of the problem, look into the following: To solve the issue, uninstall the unwanted app with CleanMyMac or similar app while in the Safe mode.
Safe mode limits the macOS to its most basic functions while allowing you to recover your Mac. Press the Power button while holding down Shift Release the Shift key after login dialogue shows up.
If your Mac doesn't turn on or start up
Did your Mac wake up? While in the Safe mode, you might try running a couple of maintenance utilities. I've been using CleanMyMac for some years now because of its Verify Startup Disk tool, which may give you a clue why your Mac is not booting up. Verify Startup Disk tool , which may give you a clue why your Mac is not booting up.
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Launch CleanMyMac you can get its free version here 2. Click section "Maintenance" 3. If your Mac is running, this will forcibly cut the power to it and force it to restart.
1. Check your charger’s cable
On a Mac desktop iMac, Mac Mini, or Mac Pro , unplug the power cable, leave it unplugged for ten seconds, and then plug it back in. In some cases, you may need to reset the system management controller SMC firmware on your Mac.
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On current MacBooks without a removable battery, plug in the power cable. Release all four buttons at the same time, and then press the Power button to turn the Mac on. On MacBooks with a removable battery, unplug the Mac from its power source and remove the battery. Press the Power button and hold it down for five seconds. Release the Power button, reinsert the battery, plug in the Mac, and press the Power button to turn it back on. Plug it back in, wait five more seconds, and then press the Power button to turn the Mac back on.
What to Do When Your Mac Won’t Start Up
Hopefully one of the above troubleshooting steps worked for you and now you can operate your Mac again after a frustrating moment of not being able to. Here are some of the things you can check if you suspect a power issue to be the cause of your Mac not turning on: Make sure your power connection is good — If you pulled a little too hard on your power cord the last time you used it, it may have unseated itself slightly from the wall outlet. Verify that the power outlet works — If you recently had a power surge, or the outlet is old, it may have just stopped working. In some cases, you may need to buy a new one because it was damaged during a power surge or was broken from a fall, drop, or wire shear.
Try leaving the computer plugged in for a while, and then try to turn it on again.
Disconnect power-hungry accessories — If you have a lot of accessories plugged in to your computer, such as USB printers, hubs, or mobile devices that use a lot of power, you may want to try unplugging them.