PSP Go buttons not working when turned on, can hard reset

I recently got PSP Go. When i try to turn it on, it boots up without problem but not a single button works. I took it apart, cleaned it and put it back together with no result. I tried combination of triangle+square+select+start and power on and I was able to reset it as I was greeted with setup screen, but the buttons just wont work when its on.

Any idea what could be the issue?

I cant connect it to PC via USB as its in setup screen.