cinema HD display probably no video signal, led only blinking

Hallo,

I would like to know if there is any way to recognize problem with cinema HD display.

After reconection to my MacBookPro5,5, screen is only dark and led is blinking "long" and "shor"...

USB ports work properly.

Minidisplay from MacBook works checked on diferent display.

Is there any fast check or service shop only?

Thank you

ondrej