单项选择题
A. Cycle the power on the network printer.
B. Verify the network cable is connected to the printer.
C. Reinstall the printer driver.
D. Restart the print spooler service.
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?（）
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?（）
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?（）