Turn on, turn off the old computer:
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Modem connection, signal, interference
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Turning on the laptop, fan noise, shutting
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The USB flash drive is inserted, removed
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Computer interface, alarm
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Manual copy machine
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Closes the CD / DVD tray, Opens
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Read, write, Hard disk, room noise
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Pressing a keypad, input error sound
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Turn off the hard drive, Turn on
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Computer mouse movement
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Computer keyboard
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Floppy disk reading
★★★★★