Letterbox  display when booting

i have a 2012 macbook pro running latest osx.  in order to give a presentation to parents at school i booted the computer while connected to an lcd projector with a different resolution (800 x 600, i think) than the macbook.  now, whenever i boot the macbook it has black letterboxes on either side of the screen.
the first time i booted it after the presentation i had to switch the resolution back to 1680 x 1050.  once the computer gets past the apple logo and that circular rotating dash thing, it reverts to 1680 x 1050 and the letterboxes go away, but for some reason it bugs me. 
is there a way to stop it from doing this?  
thank you for your time!

I had the same issue and I fixed it by resetting the PRAM.
http://support.apple.com/kb/HT1379
I hope this helps.
Thanks.

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    Shoot 16:9 HD
    Down convert 16:9 SD
    Edit 16:9 SD
    Export 16:9 SD
    DVD Studio Pro 16:9 letterbox Display mode
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    Shoot 16:9 HD
    Down convert 16:9 SD
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    DVD Studio Pro 4:3 Display mode
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    - In DVD Studio Pro under preferences under the project tab choose DVD standard: SD DVD
    - Under the general tab SD menu,choose Display mode 16:9 LETTERBOX
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    Marinus

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    Reset PRAM:   http://support.apple.com/kb/PH14222
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