MacBook won't start up (mainboard)

Hi to everybody!
My MacBook won't start up anymore.
I know since several week that the mainboard has problems: when I pressed on the bottem around the battery, it restarted randomly.
I didn't send it in yet because I needed it and could live with this flaw.
But now it doesn't start again. I just hear one single click from the disc-drive and then nothing happens. I'd just need to reboot it ONCE to backuo my data before sending it in.
Do you have any ideas how I could make it work?
Thanks,
Bensch

You will need another mac to do this, but if you follow this article it will show you how to mount your drive as an external harddrive on another computer.
Or else you could just remove your harddrive.
but give this a try first.
http://docs.info.apple.com/article.html?artnum=58583

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