Macbook never shuts down

I have a Macbook 2,1 running 10.6.8 that is fully updated (system updater can't find any new updates)
Whenever I put my computer on sleep, the DVD drives constantly makes the noise it does when it wakes up (DVD laser moving back and forth, every 10 seconds), and if I leave it unplugged, the battery dies real quickly (a new battery) and the computer is really hot, so I know the computer really didnt go to sleep. Also, when I shut down the computer entirely, it shuts down, then 10 seconds later automatically boots up again on its own. The only way I have been able to shut it down fully is to unscrew the battery when its shut down before it has a chance to restart.
This is a relatively new problem, as of like 4-6 months ago. Thanks a lot

try to repair you permissions. start up from you restor disc and use the disk utility to do this.
to start up from the disc, put the disc in and restart and hold down the "c" key

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