单项选择题
A. StickyKeys is enabled and needs to be disabled.
B. The new keyboard is defective and needs to be replaced.
C. The system board is defective.
D. The keyboard ribbon is not seated properly.
单项选择题 A technician has a laptop that is running slow and notices the fan is on high. Which of the following should the technician try FIRST?（）
单项选择题 A technician is installing a parallel PCI card. Which of the following is the IEEE standard for parallel?（）
单项选择题 A customer, Jill, has a dim image on her internal LCD panel, but when connecting to an external display, the image is fine. Which of the following is MOST likely the cause?（）