Turning on the laptop, fan noise, shutting down:
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The USB flash drive is inserted, removed
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Signal, interference, Modem connection
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Computer keyboard
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Computer simulated laser
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Repeatedly pressing a computer mouse
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Computer interface, signal read information
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Computer noise, Communication room
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Turn off the old computer, Turn on
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Matrix printer
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Closes the CD / DVD tray, Opens, disc read
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Computer interface, alarm
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Input error sound, Pressing a keypad
★★★★★