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A technician has rebooted a PC, and the machine has paused on a black screen with a white blinking underscore on the top left of the screen. Which of the following is the MOST likely problem?

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A technician has rebooted a PC, and the machine has paused on a black screen with a white blinking underscore on the top left of the screen. Which of the following is the MOST likely problem?






 
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