Apple Mac Pro User Guide

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Chapter 4   
Problem, Meet Solution
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Make sure the side panel is closed (following the instructions starting on page 52) and
the PCI port access covers are in place (see “Adding PCI Express Cards” on page 74).
Antenna reception is reduced when your Mac Pro is not closed properly.
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Check the AirPort signal level. You may have up to four bars in the AirPort status icon
in the menu bar.
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See AirPort Help (choose Help > Mac Help, and then choose Library > AirPort Help
from the menu bar). Also see the instructions that came with the wireless device for
more information.
Problems with Your Display
NOTICE: 
If you have a problem with your Apple display and nothing in this manual
solves it, contact an Apple Authorized Service Provider or Apple for assistance. If you
attempt to repair the display yourself, any damage you may cause to the display will
not be covered by the limited warranty on your display. Contact an Apple Authorized
Reseller or Apple Authorized Service Provider for additional information about this or
any other warranty question.
If no image appears on the screen
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Make sure the computer is turned on, and if the display has a power button, make
sure it’s turned on.
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Make sure the cables are connected properly to your computer and the display.
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If your graphics card has an internal power cable, make sure it’s connected to the
card and the logic board.