单项选择题
A.batteries
B.power cords
C.disk drives
D.hard drives
单项选择题 Duringbootup，alaptopscreendisplaysverticalcoloredlinesandthentheLCDscreengoesblank.Therearenodisplayproblemswhenconnectedtoanexternalmonitor.Whichofthefollowingactionsshouldbetakentoresolvetheproblem？（）
单项选择题 Whenconnectingalaserprintertoanetworkforthefirsttime，atechnicianshouldFIRST：（）
单项选择题 AworkorderstatesthatacustomerusedWindowsupdatesandafterrebootingthecomputer，thevideodriverwascorruptedandthecomputerwasinsafemode.WhichofthefollowingwouldbetheBESTactiontotake？（）