How to restore display on MacBook Pro to original settings after faulty external display connection

Rookie question, 2009 MacBook Pro. We bought a dvi-VGA adapter to connect to an external display. Got a picture on the external monitor but very poor resolution. Meanwhile the display on the MacBook Pro re-set itself and we were not able to restore it to normal even after we disconnected the external monitor. We now have our MacBook Pro with messed up resolution and display, AND no external display. How do we get the MacBook Pro back to its default display settings? Any help greatly appreciated!

this is from another discussion:
jk10003
Re: MacBook doesn't sleep when closing lid with external monitor attached with Lion Oct 14, 2011 7:01 PM (in response to admgtz)
I would like to offer this solution. I have a MacBook Pro with an external monitor, and, for a year and a half both displays slept when I closed the MBPS. This behavior stopped when I installed Lion. They would sleep when I removed the power cord, but what a pain that would be. The command "pmset -g assertions" gave no indication of which process ought be preventing sleep.
I contacted Apple support, and after some searching, the guy working with me found this thread, which was flagged as an Apple-approved solution:
https://discussions.apple.com/thread/3190417?start=165&tstart=0
This is the important part:
Correct AnswerRe: How do I tell Lion to disable the LCD screen even when the lid is open?
Aug 31, 2011 9:56 AM (in response to Bob_viking)
Here's the command to make your laptop behave like it did Pre-Lion (courtesy of my friend):
sudo nvram boot-args="iog=0x0"
Works perfectly for me. If it screws up your system, just zap the PRAM next boot (cmd-opt-p-r) and you'll be back to the default Lion state. Or if you can still get into terminal, this command will get you back to Lion's default state as well:
sudo nvram -d boot-args
Enjoy!
One snag was that I had to run it with the external monitor disabled, but it worked great!

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         Note: You will need an active Internet connection. I suggest using Ethernet if possible because
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          1. Restart the computer while holding down the COMMAND and R keys until the Mac OS X
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          2. Select Disk Utility from the Mac OS X Utilities window and click on the Continue button.
          3. After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click
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          4. Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security button
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          5. Click on the Erase button and wait until the process has completed.
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          7. Select Reinstall Lion/Mountain Lion and click on the Install button.
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