单项选择题
A laptop has a non-functioning keyboard. After the keyboard was replaced with a known good one, the technician finds that the keyboard still is not functioning. Which of the following steps should the technician take NEXT?（）
A. Replace the motherboard.
B. Check all connections.
C. Replace the USB controller.
D. Check the PS/2 connector.
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单项选择题
A technician has lost a necessary jumper for a new hard drive that must be installed immediately.Which of the following is the BEST solution?（）
A. Use a jumper from the motherboard where the new drive is going to be installed.
B. Use a jumper from a hard drive that is no longer functioning.
C. Contact the manufacturer of the new hard drive and have a replacement jumper shipped immediately.
D. The new hard drive must be replaced -
单项选择题
A PC is powered on and begins POST. The PC takes a long time when scanning for drives. The BIOS reports no hard drive can be found but the CD-ROM is identified. The technician knows that there are two hard drives on the primary EIDE controller and a CD-ROM on the secondary EIDE controller. Which of the following is the MOST likely cause of the problem?（）
A. Both hard drives have the master jumper in place.
B. One hard drive is set as master and the other slave.
C. The hard drive data cable is reversed.
D. Both hard drives have the cable select jumper in place. -
单项选择题
A technician receives an error message ‘inaccessible boot device’ on their monitor. Which of thefollowing components is causing the issue?（）
A. Hard disk drive failure
B. NTLDR file is missing
C. BIOS is corrupted
D. System board failure
