XPS M1330 won't power up

Hi!
My 2.5 year old Dell XPS M1330 would not power up. (An overheating gpu/motherboard was replaced 1.5 yrs ago from Hong Kong Dell).
I installed windows update then it is in auto shut down after installing.
I booted it, it was updating some dir files in DOS (the usual), then screen goes black for a moment, I thought it just preparing to go to Windows logo but suddenly it powered off by itself.
Then after that, it won't power up anymore.
It won't power up through battery and AC adapter plugged in. Tried other combinations also.
The odd thing is, the power indicator in the AC adapter goes off when plugged into the laptop. It will light up again after re-plugging into an outlet but goes off again when plugged into laptop.
I know the problem regarding overheating gpu but this one is really different.
Any idea?

 

Try looking at this thread: http://forum.notebookreview.com/showthread.php?t=297570&highlight=m1330+won't+turn+on

 

Thanks man!
that's exactly what happened to my laptop.
It's good to gain some insights on the problem.

Thanks!