Turn on, turn off the old monitor:
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Computer noise, Communication room
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Opens, closes the CD / DVD tray
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Matrix printer
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Turn on, turn off the old monitor
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Manual copy machine
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Floppy disk reading
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Computer mouse movement
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Hard disk, write, read, room noise
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Modem connection, signal, interference
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Turn off the old computer, Turn on
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Computer simulated laser
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Office work, general noise
★★★★★