单项选择题
A user needs a laptop keyboard replaced because the space bar is not working. Mike, a technician, replaces the keyboard, and notices that a diagonal set of keys will not respond.
Which of the following is the MOST likely cause?（）
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.
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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?（）
A. Clean the heatsink assembly of debris.
B. Turn the fan off when the AC adapter is attached.
C. Turn the fan to low in the BIOS.
D. Replace the processor and fan. -
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A technician is installing a parallel PCI card. Which of the following is the IEEE standard for parallel?（）
A.802.11b
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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?（）
A. Inverter
B. LCD cable
C. LCD panel
D. System I/O
