Sweet! Glad to hear that!
And now that I've managed to help you with completely trivial tips, here's another one:
Try plugging in the other battery, and without attempting to start, plug in the charger, and let it lie there for a couple of hours until the battery should be charged. Afterwards - unplug, and try to boot again.

Seems like being out of battery makes it behave totally weirdly... This worked for me, I don't have the luxury of a spare battery =)