Mac Pro 2010 Manual

84 Chapter 4 Problem, Meet Solution
If the computer doesn’t turn on or start up
Â Makesurethepowercordisconnectedtoaworkingpowersource.Theplugon
thepowercordmustbecompletelyinsertedintothecomputer’spowersocketand
rmlyseated.
Â RestartyourcomputerwhileholdingdowntheCommandkey(x)andRkey,until
thecomputerrestarts.WhentheMacOSXUtilitiesapplicationappears,selectan
optiontorepairyourdisk,restoreyoursoftware,orreinstallMacOSXandApple
applicationsfromtheMacOSXUtilitiespane.Formoreinformation,see“Repairing,
Restoring,orReinstallingMacOSXSoftware”onpage86.
Â Ifyourcomputerstilldoesnotstartup,tryresettingtheparameterrandomaccess
memory(PRAM).TurnonthecomputerandimmediatelyholddowntheCommand(x),
Option,P,andRkeysuntilyouhearthestartupsoundasecondtime.Releasethekeys.
ThePRAMisresettothedefaultvaluesandyourclocksettingsmayneedtobereset.
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IfyourcomputerdoesnotstartupafterresettingthePRAM,restartyourcomputer
whileholdingdowntheOptionkeytoselectyourstartupdisk.
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Ifthisdoesn’twork,restartyourcomputerwhileholdingdowntheShiftkey.
If you’re unable to eject a disc
Aleonthediscmaybeinuse.Quitapplicationsthatareopen,andthentryagain.
Ifthatdoesn’twork,chooseApple()>Restartandholddowneitherthemouse
buttonortheMediaEjectkey(C)onyourAppleKeyboard.
Ifthatdoesn’twork:
1 Shutdownthecomputerandremovethesidepanel(seetheinstructionsonpage39).
2 Pulltheopticaldrivecarrieroutoftheopticaldrivebay(see“ReplacinganOptical
Drive”onpage68).