2 problems w/ Dual 2.0 G5

Hi,
I'm having a couple problems with my Dual 2.0 Power Mac G5 (early 2005) and wondering how I can fix them and if they might be related.
Problem 1:
My 20" Apple Cinema Display keeps going black. I'll come back to my computer after it has been on, thinking the display has gone to sleep. But when I move the mouse, nothing happens. The computer is set to never sleep, only the display. So then I shut the computer down by holding the power button for 5 seconds, and try to turn it back on after a minute. I can hear it starting up, but again, the screen stays black.
This has happened a few times over the past 6 months, but turning it off and on a couple times would eventually get the display to work again. This time, however, I'm having no such luck. Did my graphics card die?
Problem 2:
Again this has happened a few times over the past 6 months, but now it has happened twice in a row. After not using the computer for a while, I will notice the fans starting to run really loudly. At first, I just thought it got hot and the computer was trying to cool down. But they would run really loudly for a pretty long time, so I would check the computer to find it has locked up.
So now I can't get my computer to turn on and function properly. I'm not sure what to do or if these two problems are related. A couple days ago I installed a new SATA hard drive in the second hard drive bay. The installation went fine and I have already transferred some files over to the new drive, but I've got to wonder if the drive might have something to do with it. The problems have occurred before I installed the drive, but now they are occurring more frequently.
Any help is greatly appreciated. I am still covered under Apple Care, but I would like to take care of this myself if I can.
Thanks,
David

David-
The only way to troubleshoot the display at this point is to hook it up to another computer and see what happens. Combined with your second problem it certainly would appear as though this could be a problem with the graphics card. You could take a look at the error logs and see if anything interesting is there.
I would invoke AppleCare if all possible. When a Power Mac fails it can be expensive to repair. If something is failing now it would it not be better just to get it repaired and have no more worries? The nice thing is that the AppleCare covers your monitor as well.
Luck-
-DaddyPaycheck

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