Ipod Nano 6th Gen not turning on after lcd change

again, Hello People,

=D

I changed the lcd and flex cable over on a ipod nano but the new buttons didnt seem to work (power did, volume didnt). i took it out of the body and connected the touchscreen and flex cable to see if there was a kink in the flex . i did try turning it on and then realised it could be abad idea as the earth points wernt connected. anyway, i put it all back in the body and it doenst turn on at all. i did read somewhere it could be the circuit board shutting down and there are ways of waking it up......eg. draining the batt, short curcuit etc......wondering if anyone has any ideas......