I removed battery without turning off computer, now it will not boot up or eject cd

I removed battery without turning off my mac book pro. Now it will not boot up or remove cd. I tried restarting with eject, spacebar, command e, option, trackpad, and f12 depressed, individually each time to no avail. I installed a 2 gb. ram kit and loaded OSX Snow Leopard after removing battery. I tried reinstalling the old ram with no luck..................Any help or suggestions would be welcome...........Thank You!