Gaming DSi does not react to power button

[xonn]

Hello, I need your help again with a DSi that does not power up.
I opened it in order to swap dpad and buttons, and after closing it, I have discovered that power button do anything (screens/leds).
I have checked that battery charge perfectly, and orange led is on all the time... Where could be the problem?
Thanks again for your time !

 

[IC]

Try reconnecting the power board

 

[xonn]

This was the ribbon cable that was problematic.