Arduino Leonardo not identified

I was using my Arduino Leonardo normally when suddenly, my computer makes the sound as if I had unplugged it. When I plugged it again, my computer didn't identify my Arduino Leonardo. Only when the Arduino is plugged and I press-still the RESET button, the "main led" starts blinking (as when I normally uplaod a code) and the computer identifies the Arduino while the led blinks, then it turns off and again makes the sound as if I had unplugged it. What can I do? Its urgent!! :( PS its neither the cable nor the computer, ive tried different ones.

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