Chosen Solution

importer, HP announced that the power source is not available as a sparepart. I suppose there is only some component which should be change. Do someboy experience of repeiring this kind of monitor.

Risto Jarvi, not uncommon that you can not get the power supply from the importer. Your best chance would be to disassemble the monitor and to take a look at the power supply. It could be as simple as a couple of capacitors or a fuse, to something more complicated. Until you have taken it apart and looked at it, anything will be a guess.