Apple MD772LL/A, MC561LL/A, MD770LL/A manual Problems with Software, To force an application to quit

3Carefully insert the end of a straightened paper clip into the small hole on the front of the optical drive.

4Push firmly until the tray opens, remove the disc, and push the tray to close it.

5Put the optical drive carrier and the side panel back in place (see “Replacing an Optical Drive” on page 68).

If the status light flashes and the computer doesn’t start up

ÂÂ If you recently installed memory, a PCI expansion card, or another internal component, make sure that it is correctly installed and that it is compatible with your computer. See if removing it allows the computer to start up.

ÂÂ If the status light still flashes, determine the number of flashes to identify the problem:

•One short flash followed by a longer off period: No valid memory.

•Three short flashes followed by a longer off period: Failed memory.

Problems with Software

When an application freezes or doesn’t respond, Mac OS X provides a way to quit the application without restarting your computer. Quitting a frozen application may allow you to save your work in other open applications.

To force an application to quit:

1Press Command (x)-Option-Esc or choose Apple () > Force Quit from the menu bar.

2 Select the name of the application you want to quit in the Force Quit Applications dialog. 3 Click Force Quit.

The application quits, leaving all other applications open.

Chapter 4   Problem, Meet Solution 85