cardinal,
it depends on where you are in your green card step. if you have reached 140 and/or 485 then it may pose some issue. but should not be a big deal.

not a problem as long as you have not violated any immigration laws.

all you have to do is get I-20. go to school. if you want can go back to home country and get F1 visa stamped and come back.

its perfectly okey.

Good luck and wish you all the best.
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yekloyatri,
its not about attitude or anything.
there are lot of people who have different priorities. i am sure cardinal's step is a rarest of all. but it is not something unique. Lot of people have done that for various reasons.

after couple of years of working sometimes one would just realize that it is not what he/she wants to do. they might want to get a terminal degree and be a professor.

sometimes one gets so bogged down with american corporate crap. one just wants to get out of it. all depends......

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once again
what do i knoe (O: