i would guess this is maya 8?? because i am having exactly the same problem and i am using nvidia Quadro4 750 XGL and that definately has open GL on it, in it, whatever it is?
I hope you can solve it because I'm having to use maya 7 and 8, maya 7 for hardware rendering of anything because 8 will not do particles or high quality view port render?
I kind of like 7, maybe i haven't used or read the advantages of 8 yet. not being a real wiz on maya i find it hard to see much differance except fot the logo when it boots up.
take it easy and life will be easy