T400 Power Problem: Flashing AC Power LED, No Battery Charge, Screen Flicker, No AC Boot

I bought a refurbished T400 less than 3 months ago. Today the power status change beeps started going off every minute or so, the power indicator light went off (while plugged in) and the battery began discharging. At the same time, the screen started flickering.
I powered down and tried draining the static by using the old trick: removing the battery and ac plug and pressing the start button 10 times and then holding on the 11th try. Didn't solve the problem.
When I use battery only, the screen doesn't flicker.
Plug in power and the screen starts flickering again, with the power LED mostly off but occasionally flickering on briefly.The battery is not listed as charging. Nothing to indicate that the power is plugged in, except for the occasional flash of the LED and the power status change beeps.
When I power down again and stay plugged in both the power LED and the battery LED keep flashing. First both are flashing green, but in a few minutes the battery light turns flashing orange.
If I remove the battery, both LEDs keep flashing. Try to power on that way and nothing happens - the LED's keep flashing, but it doesn't power on at all
Battery is new (the first one shipped wouldn't hold a charge at all; this one lists as good condition).
I don't have another Lenovo power supply to try, but the current one doesn't appear damaged or bent at all. I tried jiggling it while plugged in and there was no change.
The last thing I did before the problem began was remove a scanner from the usb port. I heard the thinkpad ports were fragile, so I am always very careful and gentle when using. I cannot see any damage to the ports.
I have about 70% battery charge left to work with, according to power manager.
My 30 day warranty is over, so I either figure this out, or I'm out the purchase price of $260., which I know is cheap for a replacement laptop, but a lot for only ten weeks of moderate use.If it's the motherboard I don't think it would be worth replacing - am I wrong? But what else can it be?
Any troubleshooting suggestions greatly appreciated. Please help! Thanks in advance for reading.

Thank you so much for the quick reply. It is a fake adapter - no lenovo written anywhere.
Now what? Should I test the unit with another adapter, or check the output of the adapter?
I hope that is the only problem, that would be wonderful. I'll update when I know more.

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T400 Power Problem: Flashing AC Power LED, No Battery Charge, Screen Flicker, No AC Boot

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