BeagleBone Black Not Working

I am newbie in linux. I purchased a beaglebone black 15 days ago. It was working fine. But today when I supply power to beaglebone black, only power led is ON, none of four led blinks. So, I install pre-build image of debian . Still I am not getting any thing. The only positive thing happening is that my SD card is getting partitioned.It’s means my Beaglebone black is not completely dead.so, please tell me what happens to it and how to solve this problem.

I am newbie in linux. I purchased a beaglebone black 15 days ago. It was working fine. But today when I supply power to beaglebone black, only power led is ON, none of four led blinks. So, I install pre-build image of debian . Still I am not getting any thing. The only positive thing happening is that my SD card is getting partitioned.It’s means my Beaglebone black is not completely dead.so, please tell me what happens to it and how to solve this problem.

You need to connect a serial debug cable to understand what your BBB is doing.

http://elinux.org/Beagleboard:BeagleBone_Black_Accessories#Serial_Debug_Cables

Regards,
John