Only Power LED

Hi, I just got BBB and after pluging-in usb power only power led is on, no matter how log I wait. I tried to download image on sd card from beagleboard site and flashing seems to be working. About 20 minutes all leds blink and then they just stay on. But after restarting nothing happens as before. Is there some way I can bring board to life or it is all broken?

PS: during flasking I pluged in hdmi and I could see for flashing information screen but only for a brief moment and then it went off. This behavior is repeating.