Ok, this is:
I have a G31M-ES2C with a Quad at 2.33 GHz, and video card is a nVidia GeForce 7200 GS 256 Mb (NVkush+EFI strings). with iPC 10.5.6 vanilla updated to 10.5.7 using combo update, no problems at all, only sound, use HDA.kext from 10.5.6

Now the problem is, QE/CI is ok in System Profiler, but Photoshop not take the video card to acellerate de Graphics.. i trashing photoshop prefs, with no result..

Any ideas?