单项选择题
A. Test the computer with a known-good monitor.
B. Check if the monitor is still covered under the manufacturer’s warranty.
C. Replace the monitor’s power cord with a known-good power cord.
D. Swap out the computer’s video card.
单项选择题 A user states that their work PC has become infected with a virus. Which of the following shouldthe technician do FIRST?（）
单项选择题 A user has recently added a second IDE CD-RW drive to a machine in addition to the primary DVD-ROM drive. The drive opens and closes; however, they do not see it show up in Windows. Which of the following is the MOST likely cause?（）
单项选择题 A PC administrator is trying to implement BitLocker full disk encryption but the PC reports that asecurity module is not found. Which of the following should the administrator do to correct this?（）