My Macbook Pro won't start anymore - Tries to start then shuts off...

I bought a new Macbook Pro recently to replace my old Macbook Pro. Before I began transferring files, my old Macbook Pro told me to update all my software first. I updated the software and then went to restart. After I restarted the old MBP wouldn't turn on properly.
Every time I turn it on, it makes the default Mac noise, then shows the apple logo for a few seconds before shutting off to black screen. This has happened ever since.
I've heard people saying I can fix this via single user mode or reinstalling the OS, but I no longer have the disks. I also can't take it into the Genius Bar since THe screen is very cracked making it difficult to transport via subway.
I'd appreciate any direction or advice I can get since I'd really like to recover a lot of the files. Some people I know don't think it's hardware issue, let me konw what you think!
Thanks for your help.

I've backed up some. But I'd love to be able to get at the other stuff on there. I'm going to acquire the disks although I just don't remember which version of 10.5 it is.
Also do you think there would be any way to transfer the files even if its not completely booted up? Like if I used Migration Assistant through a firewire or ethernet? Or would I have to OK the transfer somehow on the other computer. There must be some what to tap into the hard drive without booting completely through.
THanks for your help.

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Message was edited by: Klapschaats

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<Edited by Moderator>

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