Computer crashed - now I get folder with question mark on startup

Last week my computer froze when I was using it.
I waited about 15 minutes and it was still frozen. So I powered it off.
I re-started computer and ran Disk Warrior. It repaired some files. Now when my computer re-starts I get the folder with the question mark for several minutes -- and then it boots up.
What is the file it's looking for? Is there any way I can fix it?
Thanks.

Hi, Sean.
This indicates the system was having problems finding the startup disk.
1. In System Preferences > Startup Disk, be sure the desired disk is selected as the Startup Disk.
2. As a general check, run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
3. See also "A flashing question mark appears when you start your Mac."
4. Did you write down the errors found by Disk Warrior or save the report? The worst-case scenario here is that the OS is corrupted and has to be reinstalled via Archive and Install. See my "General advice on performing an Archive and Install" FAQ for some important tips on this process if you decide to go that route as no other troubleshooting has corrected the problem.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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Hi,
I need help please.
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leonel junior wrote:
I boot from the Lion DVD,
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I turned off the computer and next morning I turned on agian and this time with no problems, I use it for a few days with no problems but yesterday it happens again...
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