Satellite P50t-A won't power on without AC Charger plugged in

Hi there,
I'm having an issue with the power on my P50t-A.
History...
For a while, I was getting less and less time out of the battery, until eventually one night it reached 0% with the AC charger plugged in, and windows telling me it "plugged-in" and "charging". It never increased from 0%, and would shut itself down.
Given this history, I figured the battery had finally died.
I ordered a new battery, opened up the laptop and replaced the old battery with the new one. I assumed at this point it was a no-brainer.
I plugged the laptop back into the AC Charger, and without turning it on, let it charge up for the firs time. After several hours I noticed that the charge light remained red (as opposed to white - charged). I decided to turn the machine on to see where the charge was upto; 75%. Windows says "plugged-in" and "charging". I thought fine, I'll turn it off and let it go a bit longer.
Came back a couple hours later to find the charge light still red. Turned on the machine to check the charge status - guess what - 75%.
I shut the machine down, unplugged the AC charger, and hit the 'on' button... NOTHING.
Opened up the machine, confirmed the battery connectors are plugged in - all seems OK.
Did plenty of forum searching, some posts said upgrade the BIOS, so I did that - now has the latest (at the time, 1.9). No change.
Tried various other updates with the Service Center application, nothing.
Found something referring to uninstalling and re-installing a microsoft battery device driver (I didn't see what something in the OS would have to do with it, since the issue begins before boot, but I thought heck - I'm running out of things to try - I'll give it a go) - no change.
Eventually landed on a post refering to this Toshiba post, talking about a battery reset button:
http://support.toshiba.com/support/v...tentId=4004523
Tried the battery reset button, with both the AC charger connected and disconnected. No luck.
I'm now at a loss, and worried something is wrong with the motherboard.
It's almost as if the laptop recognises the battery is there, but can't (or won't) send or draw power from it.
Anyone seen this before, or know of a solution?
Many thanks.

I'm now at a loss, and worried something is wrong with the motherboard.
I’m afraid you could be right…
Usually the DC IN / Battery indicator will glow amber while the battery is being charged.
In case the notebook is OFF the battery should be fully charged after about 3 hours… if the notebook is ON, the charging time would be a little bit longer… after about 6 hours the battery should be fully charged.
In such case the Dc IN / Battery indicator should switch the status to “white”. This would indicate that the battery is fully charged…
New batteries need to be calibrated to reach the best performance…
Calibrating means that the battery should be discharged until its fully empty and then charged again till the DC IN/battery indicator would glow white.
This process should be repeated two, three times until the battery recovers normal capacity.
As mentioned, the DC IN / Battery indicator should glow amber to indicate that the battery pack is being charged. However if the LED does not glow, this indicates that power is not being supplied correctly.

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> {quote:title=Al-eX wrote:}{quote}
> hi keeslaff,
> take out battery and run the unit on ac-adaptor.
Already did that, same result
> check if hdd spins up (maybe hdd died)
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