Portege M900: Power Problems Battery and Charging

I hope someone here would helped me out in my problem. I bought my Toshiba Portege M900 last 2010. I would always plugin the charger to my laptop when I am at work.
There this one time that when I turned on my laptop, the battery was about to be empty like 7% remaining. I took my charger and plugged it in. After 5 seconds, it turned off without any warning or so.
I checked the lights in the laptop, the "charging light" is not ON despite that the charger was plugged in the socket. I tried to use the charger to my other Toshiba Sattelite Laptop and it worked.
I tried to remove the battery of the Toshiba Portege M900 Laptop from its place and plugged again the charger but still it did not turned ON.
So I took my Toshiba Portege M900 to the nearest service center. But surprisingly when I got there and related the problem to the technician, the laptop turned on after it was plugged. The technician said, he couldn't see any problems because the laptop was charging and it turned on right.
But when I took it home, whenever I remove the charger from the socket of the laptop, it would turn off immediately without any warning eventhough that battery is 100% charged.
And there were times, even if I remove the battery from the laptop but still plug the charger in.. the laptop will still NOT TURN ON.
I tried to check the Toshiba PC Health Monitor, but it would said that the battery is working good. What do you think seems to be the problem? Is it the battery, or the power jack, or the motherboard or the charger?

> Is it the battery, or the power jack, or the motherboard or the charger
I dont think its battery issue.
Why? Because the notebook does not power up even if the battery is removed but connected to AC adaptor.
_Power jack?_
Maybe. It could be possible that power jack or connection between the power jack and the motherboard isnt ok.
_Motherboard?_
It could be an problem with power supply electronic which is part of the motherboard but once again; this is just an idea
_Charger /AC adaptor?_
Hmm you said that the AC adaptor has been tested with another notebook and it worked. So possibly its not AC adaptor issue.
But are you sure that the other notebook did not run at battery power?
Has the AC adaptor been tested properly? This is an open question.
Another idea:
What BIOS version do you have installed on M900?
Found an BIOS update for the Protege M900
+BIOS version 2.40 upgrade for Portege M900 and Satellite Pro U500( For PSU56*, PSU5C*, PSU5J*, PSU5Q*, PSU86*, PSU8G* and PSU53* ONLY)+
http://pc.toshiba-asia.com/support/drivers/details/30516
There you can find an detail about fixed issue:
+System may not power on without using AC Adapter after the battery has been detached and reattach again. This has been fixed.+
Please check if your Portege M900 is one of the mentioned models and check if an BIOS update is available for your unit.

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