单项选择题
A. Hard drive cables are not connected.
B. BIOS chips are not seated properly.
C. The power supply is not functioning.
D. Video card is not seated properly.
单项选择题 A technician needs to upgrade the memory in a laptop. Which of the following memory typeswould be the correct type?（）
单项选择题 A user explains that after the office was vacuumed the previous night their sound is not working and they cannot get onto the network. The user has verified that all of the PC’s cables are plugged into their respective ports. Which of the following is the MOST likely cause?（）
单项选择题 Which of the following describes the random access memory limitations with Vista 64-bit operating system?（）