MacBook won't go past startup screen

My MacBook won't go past the startup screen.
This happened after I tried reseting my battery because it was not being recognized since it was drained completely. After removing the battery and re-inserting it was still not being recognized. So the support website advised to try downloading the latest update. However, before downloading the last item, it showed a message saying that there had been an error in the download, to go ahead and erase the current download and try again. However, when i clicked "ok" on the error box, it automatically went to re-start and I have not been able to go past the gray screen with the apple...the waiting circle just keeps going round and round.
I have tried to start it pressing the c key and the shift key but it did nothing. I then tried to start it with disk 1 and it does nothing either, plus the disk will not eject either.
Please help!!! what should I do???
Thank you so much for your time to help me with this.
MacBook 1,1   Mac OS X (10.4.9)  

To eject the disk, hold the trackpad button down as the machine restarts.
Is your data backed up?

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