Laptop plays usb plug in sound continuously even though nothing is being plugged in

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ChloeWilson3

Hi, recently my laptop has randomly, with no apparent activation signal, started playing the usb plug in sound on repeat every 3 seconds. nothing is being plugged in, tried plugging a usb into all the ports and unplugging, nothing changed, tried restarting, shutting down and then turning on a few minutes later, unplugging the powercord, nothing changes. the sound still plays and my screen goes black and green every time the sound plays. its still doing it even as i'm typing. its been going on consistently for almost 20 mins now and is getting really annoying. any help?my laptop is an acer a515

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