Turn on, turn off the old monitor:
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Turn off the hard drive, Turn on
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Read the, Insert the disk into the drive
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Computer interface, signal read information
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Disc read, CD / DVD drive
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Jet printer
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Repeatedly pressing a computer mouse
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Communication room, computer noise
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Interference, Modem connection, signal
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Computer mouse movement
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Read, write, Hard disk, room noise
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Shutting, fan noise, Turning on the laptop
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Franking machine
★★★★★