Turn on, turn off the old computer:
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Computer simulated laser
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Double click computer mouse
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Bios, Sound signal of a bios computer
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Repeatedly pressing a computer mouse
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Read the, Insert the disk into the drive
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The USB flash drive is inserted, removed
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Floppy disk reading
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Closing the laptop cover, Opening
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Read, room noise, Hard disk, write
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Modem connection, signal, interference
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Turning on the laptop, fan noise, shutting
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Computer interface, signals
★★★★★