My macbook pro (2011) starts up very slow and has  other startup resolution

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I have two problems:
My Macbook pro (Lion) starts up very slow. Many things seem to happen during startup. The screen goes small, blue, back and many times the loginscreen is coming up in a lower resolution. When I do a Pram reset it starts up with the correct resolution but after a couple of startups it goes back to 800x600 resolution (I guess). When I Log in the resolution is ok so only the login screen is a lower resolution.
Can anybody tell me what can be wrong here?
And if there is a solution beyond resetting the PRAM?

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Hello,
For the screen resloution problem:
I don't know if you have solved your problem yet but i had the same exact problem this morning and was able to find the solution and fix it.
All you have to do is safe-boot your machine (hold shift key during restarting/booting) and after the next restart it should be fine.
Hope it helps.

November 30, -0001

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