Turn on, turn off the hard drive:
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Opens, closes the CD / DVD tray
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Laser printer
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Photocopy (photocopy)
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Input error sound, Pressing a keypad
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Computer noise, Communication room
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Floppy disk reading
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Office work, general noise
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Computer keyboard
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Fan noise, Turning on the computer, shutting
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Manual copy machine
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Computer mouse movement
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Double click computer mouse
★★★★★