Wait five seconds, then press the 'Power' button. Wait fifteen seconds, then plug it back in.

Desktop - Shut down the iMac and unplug the power cord.

Release the 'Power' button, reinsert the battery, and plug in your computer to a power source. Unplug the power adapter and remove the battery, then hold down the 'Power' button for five seconds.

Laptop with removable battery - Shut down your computer.

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 non-removable battery - Shut down your computer and plug it into a power source.

If none of the steps above solved your problem, reset the SMC: X Research source An issue with the SMC can prevent your power button from working properly, or cause general slowdowns. The SMC, or System Management Controller, handles many of the physical components on your Mac.

Minimize everything and show desktop: (or between the desktop and Start screen in Windows 8.Reset your SMC.

Open a recently closed tab in your internet broswer: Ctrl + Shift 'T'.

For example, to copy text (Ctrl + 'C'), you would highlight the text and press and hold the 'Ctrl' (or control) key on your keyboard, then tap the 'C' key before releasing both keys. The list displays key combinations that are intended to be pressed and held until all are completed. Where can I find these keys on my keyboard? Windows

This page includes a guide to a few useful combinations that will help you complete tasks more quickly.

They are useful and often great time-savers. This method of force quit command Mac is especially useful if your mouse cursor is lagging a bit. Select the program you want to quit from the dialogue box.

Do the following: Press and hold the following keys: Command + Option + Esc. Keyboard shortcuts are combinations of keystrokes that allow you to quickly perform an action. Alternatively, you can use a force quit Mac shortcut to close an unresponsive app.

Keystrokes for force close on mac