单选题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?（）AThe memory is failing.BThe CPU is overheating.CThe hard drive is not attached properly.DThe operating system is not installed.
单选题
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?（）
A
The memory is failing.
B
The CPU is overheating.
C
The hard drive is not attached properly.
D
The operating system is not installed.
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