Hi , before 3 days .. i opened my n9 hardware , because the power button broken and still switch my device off ,
so when i open it, i fixed the button and after that i closed it.
but when try to switch it on . i got reboot loop
and after reboot loop i got screen blinking (screen still black)
and after that my device dont have vibration ,
i try to check it via flasher , it shown the battery is 0% ,
i followed a trotial for how to fix battery dead problem.
but still not working after charge .
i re- opened my n9 HW , all connecters are connected , but i notice that : when i unplug the screen connector the device work and flashing the firmware , when i connect the screen , the device turn off
and cant flash or charge via flasher .
sorry for that but please help me , i trust in yours dears
Thanks

some notes after many try :
1_ when i connect my screen , the device won't work .
2_ no vibration
3_when i charge via usb on flasher app , the device got hot on the back ,above the camera.
4_i flashed it successfuly without screen connected ,
5_ when my n9 charging via flasher , i connected the screen but the device switched off and disconnected form my PC.

you need somtechnical skills to find exactely where is the issue
may be this will help you
http://dhakamobile.com/showthread.php?t=81626