Are you sure the 700 series supports the VBO extensions? I know my ATI Mobility 7000 IGP doesn't.
I'm not sure that ATI 7000 IGP and X700 are the same series, are they ?
But i suppose my card supports VBOs because the demo "VBOTest" works on my computer (except if this demo uses vertex arrays, or somethink like that, if VBO extension isn't supported...).
And i got only once a crash, generally, i got juste a black screen during 5sec. I suppose that everything works, except that the cube isn't drawn.