Mac Pro 2010 Manual

94 Chapter 4 Problem, Meet Solution
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.
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aboutcolorandyourdisplay,
seeHelpCenter.
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.
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 Calibratethedisplay,asdescribedin“Ifthescreenimageappearsdimorickers”on
page94.
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.