回複：Have you tried without battery?--Yes, I tried to turn on with

    If you want to concern other parts,  the power button light never on even I replaced a new power button, but I can’t say it is 100% good.

   When I first returned the MB, seller didn’t say anything good or bad just gave to me the

refund in one week, I just wrote a note said “ this MD didn’t work on my NB”,

    I bought 2^nd from  a different seller and I will give him a same note when I return.

  I am going to buy another NB some time late.  But I will stop trying to fix this one.

    Maybe the reason I will never  be able to know.

   Thank you so much for your helping. I am living in VA . Now I knew where you are.

I went to SF area several times.