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What could the problem be? How do I find out what's going on?

EDIT: Hitting f2 when the progress bar is going across the screen shows that booting stops at "Starting atd: [OK]". After it reaches that point, the screen flickers a little bit and it just hangs.

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The OP was working on this answer when he encounters this problem. @jonderry I think it's better to give a little context to the problem you are having. – phunehehe Mar 8 '11 at 5:35
If things was working properly before then chances are the newly created /etc/X11/xorg.conf is at fault. Try booting into single user mode and deleting the file. – phunehehe Mar 8 '11 at 5:39
What drivers did you install? Do you have 'nomodeset' in your GRUB kernel parameters? – jsbillings Mar 8 '11 at 13:44
up vote 4 down vote accepted

Sounds very much like there is a problem starting X, especially if you were messing around with xorg.conf.

Deleting xorg.conf should solve the problem, also you should check /var/log/Xorg.0.log for errors.

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You have saved my laptop. – Wok Mar 3 '13 at 21:50
@wok: glad to hear that! – nico Mar 4 '13 at 6:18

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