T61 6465 9UU with 4Gig of RAM won't power up with power cable plugged in

Hi there.
I have a T61 that works perfectly, except the power button does not work when the power cable is plugged in. If I unplug the power cable, press the power button, everything boots up fine, with it saying I have 3+ hours on the battery after I login to Windows 7. If I plug the power adaptor in, it starts charging the battery as normal.
Any ideas why it won't boot when I press the power button with the power cable plugged in? I updated to the latest bios, and all is OK. I just received this PC, so I don't know if it had the problem in the past.
Thanks
Jeff

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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T61 6465 9UU with 4Gig of RAM won't power up with power cable plugged in

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