@gene..was ur phone comes to u dead or u did something wrong while operating it ..
am saying just coz,i did this same while trying to read codes from 3618 code reader by own made cable just trying to give high voltage to its pin 9,11+ volts,,,but i solveved this problem by change the PA...
and my another experience if phone flashed but do not get ON..
change the keypad connector,in 3618 ,i saw this cause mostly..
and this is only my experience,sharing with u..
With Best Regards