单项选择题
A. There is a non-bootable CD in the CD-ROM drive.
B. There is a non-bootable DVD in the DVD-ROM drive.
C. There is a non-bootable Blu-Ray in the Blu-Ray drive.
D. There is a non-bootable floppy in the floppy drive.
单项选择题 A user states while making several attempts to install a new version of their graphics application,they place the disk in the drive and the LED blinks but nothing happens. Which of the following is the FIRST action to perform?（）
单项选择题 A technician cannot access the print queue to delete a print job. Which of the following is the MOST likely cause of this issue? （）
单项选择题 A customer states that it takes a while to refresh their display when multitasking and switching between windows, in Windows XP. Which of the following is the BEST way to shorten the delay and increase response time?（）