NU 9w921a40006 monitor

[avz3]

Hi
I hope that you will be able to help me. I've got a monitor as mentioned above. it's problem is that when it is connected to the mains the blue led in the "ON" pushbutton blinks and the monitor won't turn on. so, if you can give me some guidelines what to look for and /or if anybody got the schematic of it, that would be a great help.
thanx.