MacBook shuts down in the middle of booting up

Yesterday, when I was working on my computer, it restarted unexpectedly about 3 times. The last time, it shut down and did not turn back on. I let it be overnight and in the morning, I turned it on without any problems. I was working for a few hours when it shut down unexpectedly again. This time, when I tried to turn it on, the status bar got a little less than half way and then shut down again. Every time I try to turn my computer, the status bar gets to the same place then it shuts down. I tried to reinstall OS X but it says that my hard drive is locked. Does anyone have any ideas? Sorry I'm not very good with computers!

Hi, rhettschneider.
Thank you for visiting Apple Support Communities.
Here is a troubleshooting article that I would recommend going through when experiencing this issue.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Cheers,
Jason H.

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Host Name: Mac-Duo
Date/Time: 2007-09-04 19:02:11.914 -0400
OS Version: 10.4.10 (Build 8R2218)
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Command: Exited process
Path: Exited process
Parent: kernel_task [0]
Version: ??? (???)
PID: 1735
Thread: Unknown
Exception: EXCBADACCESS (0x0001)
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eax: 0x00000000 ebx: 0x900241e4 ecx: 0x00000000 edx: 0xb011ef18
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ss: 0x0000001f efl: 0x00010286 eip: 0x0031599f cs: 0x00000017
ds: 0x0000001f es: 0x0000001f fs: 0x00000000 gs: 0x00000037
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MacBook shuts down in the middle of booting up

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