Turning on the computer, fan noise, shutting down:
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Alarm, Computer interface
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Turn on, turn off the hard drive
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Environmental sounds, Office work, typewriter
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Repeatedly pressing a computer mouse
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Laser printer
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Franking machine
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Computer mouse movement
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Bios, Sound signal of a bios computer
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Old computer keyboard
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General noise, Office work
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Disc read, CD / DVD drive
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Pressing a keypad, input error sound
★★★★★