Macbook pro starts but won't open

I have a problem with my macbook pro - everytime I press the power on button it starts up and the apple and timer come on and you can hear it whirring but then it turns off and restarts again and the same thing happens? Could someone help me?
Thank you
Emma

I'll quickly butt in before I go to sleep
The Mac keeps OSX and your settings and data separate, so an Archive and Install replaces the old system folder with a new one, and then copies all of your settings etc so that the new one works as the old one did. It should look like it did before - although you'll have to run software update to update the new system.
The old system folder is preserved just in case you need to access it - it's a good idea to make sure the new one is working fine before deleting it. You may well need the Leopard dvd to get the archive and install option - you can't do it going from Leopard to Tiger.
Cheers.

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