Power up problems

[Tricnic]

When the battery is in the machine, it will not boot reguardless of whether the AC is plugged in or not. Also, I am not getting any lights to indicate that the laptop is getting power, or even that the battery is charging.

I have tested the power adapter and it is putting out a steady 16.5V

When I remove the battery, and plug in the AC, there are still no lights indicating power, but when I hit the power button, it starts to power up, but after about 1 second, it loses power and I have to unplug the AC, then plug it back in to get the same result.

Has anyone heard of this?