Turn on, turn off the old computer:
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Opens, disc read, closes the CD / DVD tray
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Input error sound, Pressing a keypad
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Matrix printer
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Removed, The USB flash drive is inserted
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Double click computer mouse
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Signal read information, Computer interface
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Fan noise, shutting, Turning on the computer
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Write, room noise, Hard disk, read
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Jet printer
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Laser printer
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Closing the laptop cover, Opening
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Alarm, Computer interface
★★★★★