I just moved into a new apartment and it has a bunch of 2 prong outlets. is it okay to use a 2 to 3 prong adapter with the iMac? my macbookpro adapter has a 2 prong out (as well as the 3 prong on the extension)... it thought it would be okay for the imac. i have it hooked into a surge protector then into the wall (it is the only thing plugged in to the 6 outlet surge though). let me know. thanks!