not litting LED's

I am first to use BBB, the led’s are not litting after providing power supply from usb. Can you let me know why is it so.

Sounds like the eMMC was corrupted. Try reflashing the eMMC.

http://www.elinux.org/Beagleboard:BeagleBoneBlack Item 10.1

You can also try booting form SD card as well.,

Gerald