Ok, update:
It will boot into 'safe mode' with the #### key held down.
When I put the MacOS install disc into the drive, it gives me a command line. What do I do now?
Also, I've tried booting off the CD by holding down C and D at startup, and holding down C at startup, but then it boots with the extensions and the screen just goes black. Can I actually boot of CD with this Mac?
Help!!!