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If your computer freezes again after a forced shut down, restart it and press ⇧ Shift as soon as it begins to turn back on, then release the ⇧ Shift key when you see the Apple logo. Your computer will start in Safe Mode and attempt to repair issues with your disk. Many applications will not work in Safe Mode. Use it for the next couple steps, then restart to return your computer to normal. . Safe Mode prevents programs from opening automatically on startup. To prevent a program opening after a normal startup, follow these steps:  Open the Apple menu {"smallUrl":"https:\/\/www.wikihow.com\/images\/f\/ff\/Macapple1.png","bigUrl":"\/images\/thumb\/f\/ff\/Macapple1.png\/29px-Macapple1.png","smallWidth":460,"smallHeight":476,"bigWidth":"29","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}. Click Users & Groups. Select your user account in the left pane. Click the Login Items tab. Select the program causing the issue. Click the - button below the list of programs. If you have a specific program that you know is causing your Mac to freeze, uninstalling it (and reinstalling it, if you like) will solve the problem:  Open {"smallUrl":"https:\/\/www.wikihow.com\/images\/1\/1d\/Macfinder2.png","bigUrl":"\/images\/thumb\/1\/1d\/Macfinder2.png\/32px-Macfinder2.png","smallWidth":460,"smallHeight":431,"bigWidth":"32","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a macOS icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"} Finder. Click the Applications folder (or click the Go menu and click Applications in the resulting drop-down menu). Find the program that keeps freezing. Drag the program into the Trash. If your computer still has issues that don't seem tied to a specific program, follow these steps to repair your disk:  Restart your computer and hold down ⌘ Command + R as it starts up. Click Disk Utility on the startup screen. Click Continue. Select your startup disk and click Repair Disk. Wait for this to complete (it may take a while), then restart your computer. The SMC, or System Management Controller, handles many of the physical components on your Mac. An issue with the SMC can prevent your power button from working properly, or cause general slowdowns. If none of the steps above solved your problem, reset the SMC:   Laptop with non-removable battery — Shut down your computer and plug it into a power source. Using the left side of the built-in keyboard, hold down ⇧ Shift + Control + ⌥ Option while pressing the "Power" button, then release all keys, and finally press the "Power" button again.  Laptop with removable battery — Shut down your computer. Unplug the power adapter and remove the battery, then hold down the "Power" button for five seconds. Release the "Power" button, reinsert the battery, and plug in your computer to a power source. Press the "Power" button.  Desktop — Shut down the iMac and unplug the power cord. Wait fifteen seconds, then plug it back in. Wait five seconds, then press the "Power" button.

Summary:
Start your computer in Safe Mode. Disable open on startup Uninstall a problematic program. Repair your disk. Reset your SMC.