User Guide

89Chapter 4 Problem, Meet Solution
If no colors appear on the screen or the colors don’t look right
Â Makesurethedisplayisconnectedrmlytothecomputer.
Â OpentheDisplayspaneofSystemPreferencesandmakesurethedisplayissetto
displaymillionsofcolors.Formoreinformationaboutcolorandyourdisplay,see
MacHelp.
Â Calibratethedisplay,asdescribedin“Ifthescreenimageappearsdimorickers”on
page88.
If desktop icons move when you change the screen resolution
Changingthescreenresolutionaectsthedisplayofinformationonyourscreen.
Theoperatingsystemmayrepositioniconswhenyouchangethescreenresolution.
If the screen freezes
Â Forcethefrozenapplicationtoquit.HolddowntheCommand(x)andOptionkeys
andpressEsc.ThenselecttheapplicationinthelistandclickForceQuit.
Â Ifthatdoesn’twork,forcethecomputertorestartbypressingthepower(®)button
for5or6secondsuntilyourMacProshutsdown.Pressthepower(®)buttonagain
tostartupyourMacPro.