User Guide

88 Chapter 4 Problem, Meet Solution
Â Makesureyourcomputerisnotinsleep.Pressthepowerbuttonoranykeytoseeif
thecomputerwakes.
Â Makesurethedisplaybrightnessandcontrastaresetproperly.Usethebrightness
keysontheAppleKeyboard.Somedisplayshavebrightnessandcontrastcontrolson
orundertheirfrontedgeorontheside.
Â ResetthePRAMbyrestartingthecomputerwhileholdingdowntheCommand(x),
Option,P,andRkeysuntilyouhearthestartupsoundasecondtime.Thenstartup
usingthesoftwareinstallationdiscthatcamewithyourcomputer.
If the screen image appears dim or ickers
Â Adjustthedisplaybrightnessandcontrastsettings.Usethebrightnesskeysonthe
AppleKeyboard.Somedisplaysalsohavebrightnessandcontrastcontrolsonor
undertheirfrontedge.Oryoumaybeabletoadjustbrightnessorcontrastusingthe
DisplayspaneofSystemPreferences.
Â CalibratethedisplaybychoosingApple()>SystemPreferences.ClickDisplays,
selectColor,andclickCalibrate.Formoreinformationoncolorandyourdisplay,see
MacHelp.
Â Theickeringmaybecausedbyinterferencefromanearbypowerline,auorescent
light,oranelectricaldevice—forexample,aradio,amicrowaveoven,oranother
computer.Tryrelocatingnearbyelectricaldevicesormovingyourcomputer
anddisplay.