My macbook pro isn't starting up properly

Hi, I have recently bought this Macbook pro from ebay. I believe it's an 08 model, version 10.6.8. 2.4 Ghz Intel Core 2 duo. For some reason most of the time when I shut the computer down or put it on sleep mode when I try to boot it back up it won't do anything. It's extremely frustrating because I have no idea whats going on. Most of the time if I take the battery out and back in, it will boot up. However the other day this didn't work so I restarted the SMC by taking the battery out and holding the power button for 5 seconds, putitng the battery back in and then it booted. Just now it did it again and the battery out and in didn't work, so i tried to reset the SMC but that didn't work either but after hitting random keys on the keyboard it just randomly boots back up. Any help or sugesstion with this would be greatly appreciated.

logan5201,
did you receive two grey Apple-branded installation DVDs with your MacBook Pro? One of them has your MacBook Pro’s model-specific Apple Hardware Test. If you didn’t receive them, then you should purchase a replacement pair from Apple or iFixit. If you prefer to buy them from Apple, call them directly and have your MacBook Pro’s serial number handy — they’re not available in the Apple stores.

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