Hp zr2740w turns off after few seconds

I have the same problem as described in an earlier post:
http://h30434.www3.hp.com/t5/Desktop-Audio-Video-Monitors/hp-zr2740w-turns-off-after-few-seconds/m-p...
My HP zr2740w turns off after a second or so. Tested with vga/dvi/displayport and desktop pc/laptop, so it's not a cable issue.
My hp zr2740w was bought in July 2012 so it's probably out of warranty. I live in Finland. The webshop I ordered the hp zr2740w does not exist anymore. The HP support pages don't seem to have any support numbers for displays.
I took the display to a local IT support / electrician guy and he said it's a power supply issue. But he couldn't find a place to order the part so he could replace it.
Hopefully I'll get some answer here or an idea what to do. Wouldn't want to throw away an expensive display just because it has power issues.

@Joni_k
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Quote
Am I right in assuming it would be very unlikely the brand new CPU has failed. That would mean the mobo was defective right out of the box, correct?
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Hp zr2740w turns off after few seconds

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