Emax

Ok, I have this Emax II from eBay, the guy framed me basically but that is not the case.

The Emax powers up for a minute and then it shuts down itself again. There is a "click" sound. It powers up itself with another click and so on.

If I press my hand against the area where the SAMPLE menu is, the keyboard stays working just fine. It seems like a loose connection from the shipping.

I opened the keyboard and noticed the sound is coming from the blue board where the 8 audio outputs are located. Either that or from the power supply. 

I would like to know a bit more before going to a repair shop. I didn't see any loose wire, no damaged or blended component. 

It may be a condenser but the thing is that when I press on top of the keyboard the thing works well. Probably I have to take everything apart and get to the main board.

Any ideas?

Thank you.