The x500 class machines will power-on even if there is no CPU card installed, but they will not "bong". To get the "bong" or any other sound, you need a CPU card to run the Power On Self Test.
The reason they will power on even without a CPU card is that the little 7805 microcontroller in the CUDA chip handles the ADB bus and the Power-on logic. If it is getting 5V trickle, it's happy to turn the power supply on when someone presses the power switch either on the logic board or on the keyboard.
I think CHC's advice is spot on. Try another video card.
I think I have some VRAM around here. I'm trying to remember whether it only works in Catalyst-based machines (7200 and clones) or doesn't work in Catalyst-based machines. I know it has a flaw that causes one or the other, but I don't remember which. For that matter, I'm not all that sure where it is....
The reason they will power on even without a CPU card is that the little 7805 microcontroller in the CUDA chip handles the ADB bus and the Power-on logic. If it is getting 5V trickle, it's happy to turn the power supply on when someone presses the power switch either on the logic board or on the keyboard.
I think CHC's advice is spot on. Try another video card.
I think I have some VRAM around here. I'm trying to remember whether it only works in Catalyst-based machines (7200 and clones) or doesn't work in Catalyst-based machines. I know it has a flaw that causes one or the other, but I don't remember which. For that matter, I'm not all that sure where it is....