tried everything yall said and killalled my dock at least 30 times so my mac is screweed
So in the end, you don't know how you even changed the 3D Dock to a 2D Dock. Is that correct?
If that is the case and the instructions posted by
chrf097 and me do no work, and you can't reinstall Mac OS X due to it being your school Mac, which probably did a custom install and you not having the
Mac OS X 10.6 Snow Leopard DVD, then you can only go to the school's computer administration and ask for help there and they will probably just re-image their custom install onto your Mac. If it comes to that, you should, really, you should, backup all your personal data and settings BEFORE that.
Or you can live with it, as the Mac is still functioning, only that the Dock is not 3D, which shouldn't be that big of a loss.
Or, just a small or, you REINSTALL MAC OS X YOURSELF, as it will not delete any of your data or settings, and not any of the data the school put on, and the school's settings, and just get your 3D Dock back that way.
And again, do a backup before, maybe use
CarbonCopyCloner or
SuperDuper! to make a clone to an external HDD, that way, you can always restore to the 2D Dock in case something gets ****ed.
And backup. Just in case.