Pretty sure that is what mine did on OS 4.0 install ... PPC was bad on that card
Could be wrong.
Another symptom was that I could launch a PPC game with the Warp3D stuff but it would lock up the game after a bit. Initially I thought it was an overheating problem but after running some experiments with fans it didn't honestly seem to make a difference, lockups seemed to be random .. but guaranteed to happen if you left it on for an hour or 2, sometimes after 10 mins, sometimes after an hour.
