How can I change boot resolution?

hi guys, i plugged in my macbook pro retina into a projecter and put it on a low-res for the 'external display' in system prefs. now every time i boot up, the white screen with the apple logo comes up in that same low, 4:3 ratio resolution i set when i connected the external display/projector, even when not connected to a display/projector. After the boot screen finishes, the screen flickers to blue and then back to my user login screen in full resolution (normal).
thanks in advance

Can you guys please confirm that the same flickering happens if/when you set your resolution to hi-res instead of recommended for retina?
(as I described in here: https://discussions.apple.com/thread/4538841?start=0&tstart=0 )
Message was edited by: NoMercy34 (added my question link)

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