Arduino does not make any sound when connected to laptop?

When i connect my Arduino through usb to my laptop, it does not make any sound like something is connected but green light is on. And port option on Arduino IDE is remained grayed. I don't know maybe i might have burned my Arduino, Please help?

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Does anything show up in device manager?

Was it working before? What did you do between when it was working and when it wasn't?

yeah, i tried connecting it to different usb port and usb cable, but it still not working

No, When i connect arduino to my laptop it does not show anything on device manager. It was working before, then one day i was calibrating load cell using Hx711 and in serial monitor i have to change baud rate. I calibrate load cell many time, but one day when i was trying to connect this whole load cell circuit to arduino to laptop it wont connect.

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@Abhishek92, stop cross-posting. Other threads / posts removed.