Apple Mac Pro (8-core) - Manual (Page 53)

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Troubleshooting
If you have a problem while working with your Mac Pro, here
are some things you can try right away.
Occasionally you may have a problem while working with your Mac Pro. This chapter
gives you some solutions to try.
Problems with Your Mac Pro
If your Mac Pro won’t respond or turn on, you have trouble ejecting a disk, or the status
light is flashing, try the steps in this section.
The computer won’t respond or the pointer won’t move.
First, make sure the mouse and keyboard are connected by unplugging and then
plugging in the connectors, and make sure they are firmly seated.
Then try to cancel what the computer is doing.
 Press the Command (x) and Q keys at the same time to try to quit the current
application.
 Press the Command (x) and period keys at the same time. If a dialog appears, click
Cancel.