Macbook not starting from  install disc

Hi, I have a Macbook that I want to fully erase. I tried starting up with a Leopard install disc holding down C. Result was the grey startup screen with the icon and then a message to restart. Same result with a Snow Leopard disc and selecting the install disc as the Startup in System Preferences. No go for the lot. I would be gratefully for any suggestions. Thanks. Geoff

You must have retail install disks, i.e. generic disks for any mac model previous to that generation of Mac OS. You do not mention this detail. I suspect you do not use appropriate install disks. What happens if you use the original install disks? Or you do not have them any more?

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    The answer was in your post: "You will need to take it to Apple for repair."

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    [Mac OS X: Starting up in Safe Mode|http://docs.info.apple.com/article.html?artnum=107393]
    [What is Safe Boot, Safe Mode? (Mac OS X)|http://docs.info.apple.com/article.html?artnum=107392]
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    Sorry. that last post wasn't so clear. I started the computer without a password, but I think when I was trying to set my own password I may
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    hello,
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    I used the "option key" approach with the gray start up disk. At first it ejected the start up disk. Then I nudged the disk back in the machine and it showed on the screen as an option. I clicked on the start up disk image and it finally loaded.
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    One guy fixed it by pulling one RAM stick out...
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