On start up my screen is black!

When I start my computer up in the morning everything else starts normally. First the light comes on on the front of the computer and on the bottom of the monitor, then the start up tone rings and the computer is fully running. But my monitor is black and I do not get the apple picture or nothing on the screen.
I thought my monitor was going out, but we have another work station the same and I switched the monitors (same 27" cinema screen as mine). I can actually use the other computer and network into my computer and fully use everything on my computer.
But my monitor is black (no display)!!
I have contacted MAC and have reset the PMU button many times and sometimes this works, but most of the time it does not.
I just keep restarting the computer and finally it will start up normally with the display and everything.
I am very confused about this, Please if anyone knows anything else I can do??
Bob

Welcome to Apple Discussions!
It sounds like your graphics card is acting up...
If you have another G5 around (it seems like you might), you can swap graphics cards and see if that fixes it. The graphics card is a tall, probably blue card that fits in a slot on your motherboard. Here is a manual for replacing the graphics card. I'm not sure if it applies directly to your model G5, but it should basically be the same thing. Just copy and paste the link into the address bar and it should automatically download.
manuals.info.apple.com/en/PMG5AGP:PCI_CardDIY.pdf

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gottarace wrote:
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