Dead Beaglebone black with usb but works with 5 V power cable

Hello I am a beginner. I had connected beaglebone black to my laptop over usb. After about 30 minutes, leds were powered off. now it is not powering up over usb. If i attach 5v power cable to it, it powers up but can’t sign in using putty over ethernet. Every time it gives connection error and using this case, no drive for beaglebone black shows up in windows as it used to show with usb. I dont know what happened. can u please help ?

Sounds like your USB died. Have you tried using a different USB-port on your computer to find out if it is a problem with the BBB or with the host-PC?