My early 2008 3.1, 2.8 Ghz wont boot up.

     My early 2008 Mac Pro, 3.1, 2.8 Ghz will not boot up. I get the chime then the gray screen, then it continues to boot for approx. 15 seconds after which the gray screen freezes up. Previous to this condition I started getting a half orange frozen screen that would jump up and down while I was using the computer. Also, there were times during normal use where the screen would freeze with lots of lines all over that were small dashes. And now the computer wont boot past the gray apple screen. I have tried "C" boot from the install disc, "Shift" boot, "Option Boot", "Command-Control", "Command-Control-P-R", and multiple normal reboots and nothing past the gray screen. The only "glimmer of hope" is that when I do a boot from the Install CD, "C" or "Shift" I get a box which says I have to restart my computer using the "reset button" ? or pressing the power button for 2 seconds which led me back to having to restart and the gray screen situation all over. Thanks, I have a feeling I know what you are going to say. God Bless.

Dear Grant,
     Thank You for your quick reply; I believe your right, Sounds like this is just the normal response for problems like mine. I am hearing more and more about the video cards that were implanted into these Mac's. One guy said "don't even bother, get a new computer and save yourself the expense of future cards."
     And when you think about the behavior of my computer it makes so much sense. The computer starts up just fine, you get the chime, it loads to the next correct screen, and continues to boot up until its time for the video card to start spitting out video, then it freezes up.
     Excellent, I hope all is well.
Thank You very much,
God Bless All,
Bob F.

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