yes the 6750m is working for all of my other games at the moment (dirt 3 , cod mw3, rage, crysis warhead) but GTA IV seems to be the only one that doesnt switch over, and my bios doesnt support forcing the gpu since HP locked the bios so that it is only available in dynamics mode (kinda like nvidia optimus)
Sorry to hear that; at least it's only a problem with GTA IV.
I looked around and found this forum
. The best solution they came up with is to uninstall the drivers using driver sweeper, reboot and re-install the drivers. This seems to be a common problem with ATI cards and GTA IV, so you're not alone.