MacBook will not boot (does not pass apple gearwheel stage)

After experiencing a freeze on my computer (couldn't access even force quit to unfreeze), I hard shut down my computer. When trying o restart, it would not pass the apple and gearwheel page, eventually the apple turned to a circle with the slash through, I think means the system will not load? I have inserted the osx DVD ( snow leopard, this system is about 2 years old) and performed disk utility to check that the hard drive is not faulty. I repaired the disk since it said there were issues (minor I think since it took very little time to repair, 7 minutes about ). Still, the issue of not loading persists. A additional problem now is that I cannot eject the osx DVD, now the computer will always boot to this DVD. Could this be am issue with another hardware component? For a while I have had a battery warning, but since the battery did not seem to be in trouble, and the MacBook continued to be useable I ignored the warning, and it had been warning me for white some time without any obvious problem. Could this be the problem now? The computer seems only to boot to the disc when it is connected to the power source.

You shouldn't have waited until now to back up. You'll lose all your files eventually if you don't. Before you do anything else, get hold of an external hard drive that you can use for backup. While booted from the DVD, but before reinstalling, select Utilities > Disk Utility from the menu bar and make a backup according to the instructions linked below. If all goes well, you won't need it. After you're back up and running, set up a permanent backup solution using Time Machine.
Mac OS X v10.5, v10.6: How to back up and restore your files

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