A Stuck CD in a MacBook (4 Steps)

Press and release 'Command' and 'Q' to exit out of any currently open applications.
Hold down the 'F12' or 'Eject' key to force the CD out of the optical drive. If the disc remains stuck, proceed to the following step.
Press the MacBook's power button and click 'Restart.'
Hold down the laptop's trackpad while the MacBook restarts to force the CD to eject.
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The Backlight Won't Stay on in My MacBook (6 Steps)

Locate the 'screen brightness' keys towards the top of the keyboard. These are also labeled as the 'F5' and 'F6' keys respectively. Press each one to see if the screen brightness increases or decreases. Repeat this step while holding down the 'fn' key until the desired brightness is reached. If this does not work, proceed to Step 2.
Click the 'Apple' logo on the top left of the screen and select 'Force Quit' to stop all applications. Select 'Sleep' from the same 'Apple' menu and allow the computer to sleep. Press any key to wake the computer. If the backlight is not back on fully, proceed to Step 3.
Click the 'Apple' logo and select 'Shut down.' Turn the computer back on after the computer has fully shut down. If the problem still persists, proceed to Step 4 to begin a System Management Controller Reset (SMC).
Shut down the computer and unplug the power supply connector. Remove the battery. On the polycarbonate body MacBooks, use a coin to turn the 'battery latch' to the open position and lift the battery out. On the aluminum unibody Macbook, remove the back panel screws (note the location of each screw for replacement) and lift the panel off. Lift the battery out of the case.
Press the 'power button' and hold it down for 5 seconds. You may hear a tone or beep. Release the power button.
Replace the battery and the back panel with screws if you removed those. Reconnect the power supply cable and turn the computer back on. Use the 'brightness' control keys (F5 and F6) to reach the desired brightness.
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How to Check the Running Applications on a MacBook

View the Dock for any application icons with indicator lights beneath them. This indicates a currently running application. Click the icon to bring it in front of all other applications.
Press 'Command-Option-Escape' to activate the Force Quit Applications dialog box. This window shows all the currently running applications, and it gives you a way to close an application that has stopped responding by selecting the application and clicking the 'Force Quit' button.
Click the 'Go' menu from the Apple menu bar, select 'Utilities' and choose 'Activity Monitor' to launch the application. Look in the Process Name field in the default CPU tab to view a list of all currently active applications and processes. You can click the various tabs to sort the items by CPU usage, memory usage and other attributes.
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How to Fix a Mac OS Crash

Press 'Command-Option-Esc' at the same time. The Force Quit Applications window opens, displaying all of the open applications, with 'Not Responding' beside the application that caused the Mac to freeze. If this window does not open, press 'Command-Option-Shift-Esc' for three seconds to force quit the unresponsive program. Then open the Force Quit Applications window.
Click any application that says 'Not Responding' and click 'Force Quit.'
Restart your computer if you have not shut it down in more than 24 hours. This will clear memory being held by any troublesome applications.
Click the 'Finder' in the Dock to open a new Finder window. Click 'Applications,' then the 'Utilities' folder. Double-click 'Activity Monitor.' This will show you what resources are being used by processes and applications.
Click the '%CPU' tab to sort this column. Processes and applications are now sorted in descending order. Processes using most of the Mac's CPU (Central Processing Unit) will be shown first.
Click the 'Real Memory' tab to see which processes and applications are using the most memory. Do the same for 'Virtual Memory.' Real memory is stored on the memory chips, while virtual memory is stored on the hard drive.
Close any application that is using an unusual amount of memory or percentage of the CPU. What is unusual for memory usage will depend on the programs you run, but anything over 700MB should be examined. Any process using more than 20 percent of the CPU for more than a second or two should be considered unusual.
Relaunch the application that caused the Mac to crash.
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How to Forcibly Quit a Program in MacBook (6 Steps)

Hold down the 'Command-Option-Esc' keys on your keyboard simultaneously to open the Force Quit Applications window.
Highlight the program in the list that you want to forcibly close.
Click the 'Force Quit' button in the lower right corner of the Force Quit Applications window.
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How to Force Close Mail on a MacBook (5 Steps)

Click outside of the Mail portion of the screen, somewhere on the desktop, to open Finder. Finder is always running under your other programs, so any problem with Mail won't prevent you from using Finder.
Click on the Apple logo at the top of the screen.
Select 'Force Quit' from the drop-down menu.
Highlight Mail in the pop-up window. If Mail is red and marked 'not responding' you likely have a problem. If the text is black and not otherwise marked, you may want to wait a minute to see if the problem fixes itself.
Click on the 'Force Quit' button to close Mail. You may re-open Mail after the program is forced closed.
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