单项选择题

AnA＋CertifiedTechnicianMUSTdoaninstallonaWindowsXPsystemfromthedistributionCD.However，thesystemdoesnotbootfromthisCD.WhatistheMOSTlikelycauseofthisproblem？（）

A.TheCDisdefective.
B.TheCDisnotbootable.
C.TheCD-ROMdriveisdefective.
D.TheBootSequenceisnotsetintheBIOStobootfirstfromtheCD

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Ausercomplainsthatacomputermonitorisexperiencingajitter.Replacingthemonitorandvideocarddoesnotfixtheproblem.Whichofthefollowingcouldbecausingtheproblem？（）

A.ESD（electrostaticdischarge）
B.motherboard
C.RAMDAC
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单项选择题

AclientasksatechniciantoaddaDVD+Rburnertoacomputersystem.Thetechniciandoesthisandsuccessfullyteststhedrive.Threeweekslater，theclientcallsandsaysthattheburnerisnolongerworking.ThetechnicianlearnsthatthedrivereadsCDsandDVDs，butwillnolongerburnDVDs.Whenarrivingonsite，whatistheFIRSTactionthatthetechnicianshouldtake？（）
A.checkforafaultyIDEcable
B.besurethattheDVD+Risformattedbeforeusingit
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D.re-installtheDVDburningsoftware

A.Thetechniciandoesthisandsuccessfullyteststhedrive.Threeweekslater，theclientcallsandsaysthattheburnerisnolongerworking.ThetechnicianlearnsthatthedrivereadsCDsandDVDs，butwillnolongerburnDVDs.Whenarrivingonsite，whatistheFIRSTactionthatthetechnicianshouldtake？（）
A.checkforafaultyIDEcable
B.besurethattheDVD+Risformattedbeforeusingit
C.checkforincompatiblemedia
D.re-installtheDVDburningsoftware