I cant boot my dm3 from my samsung external dvd writer...

Hi,
I want to get rid of the windows 7 which unfortunatelly came pre-installed on my hp dm3 (more specifically dm3-1070eo). I tried changing the boot sequency to boot first from an external dvd/cd, but it didnt work with my Samsung Slim External DVD Writer.
It first shows a line with the linux version, but them it displays a screen writen error and with a drawing that looks like a stack with some hexadecimal characters. After clicking enter, it restarts...
Any clue on that? If needed, I can take a picture of the screens and post here

You don't need to reinstall.
You may need to boot into Single User Mode and enter some commands to get the NetInfo Database fixed.
Follow the suggestions Restoring the NetInfo DB and others.
http://docs.info.apple.com/article.html?artnum=107210
http://docs.info.apple.com/article.html?artnum=302150
And a good place to begin when a system refuses to cooperate is to reset or clear NVRAM. And to use your emergency backup boot drive.
Usually you select on Languages first, then, instead of going to Install -> go to the menu bar and try repairing the drive and permissions first.
And then if you must, install on another disk drive, not your main boot drive.

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