单项选择题 When replacing a laptop’s hard drive, which of the following may need to be updated?（）

单项选择题 Which of the following is a reason why Bob, a technician, should install case fans in the front of acomputer case?（）

单项选择题 When Bob, a technician, powers up a desktop PC, the unit will repeat three short beeps and will not POST. Which of the following is MOST likely the problem?（）