@steve61171 Sounds like you have an idea of what your doing and are eager to dig into the mother board but before you do have you done the obvious first ? Static discharge , memory test , Check the screen and video .To do static discharge disconnect battery and power cable then hold down the power button for 60 seconds put the battery back in and plug in the power and try powering on . to test memory pull one stick of memory and try powering it on if that brings no joy then pull the other and try the first you pulled . Then try in opposite dim slots . this will eliminate a bad dim slot or bad stick of memory. Finally check the video by connecting to an external monitor. Sometimes were in such a hurry to get to the guts of the machine we overlook the simple stuff . Hope this helps