Herringbone lines, and vertical and horizontal lines on display which dims

I have an iMac G5 purchased in 2005, six months later under the extension program for the video and power issues, Apple installed a new motherboard and a new power pack. Up to now, everything has been okay.
This morning I turned on my computer and saw the same herringbone lines, vertical lines, horizontal lines on the display which went from dark to light in color. I waited for a while, and a message said to restart my computer which I did.
Because of the previous problems, I am wondering if the motherboard or power pack is going out again. After the start up, my computer was okay for the rest of the day. I took some photos and a video of it to show what is happening to the display, any suggestions.

Thanks Scott for the quick reply. Knowing what happened five years ago with the display, I figured that this was the same issue. It is just a matter of time. I quickly backed up my system to another hard drive and wanted to confirm in the discussion group that my G5 was on it's last gasp.
Since I would be lost without my computer, I just put in an order for the new iMac 27" quad core i5 computer. Now I will have to make monthly payments again, but I think that I will have a much faster, and better computer especially with the Intel processor.
Thanks for your reply, and I hope that my new computer will last longer than five years. My track record was five years for my lime green iMac G3, and now five years for my iMac G5.
Thanks again,
DaisyMay

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Herringbone lines, and vertical and horizontal lines on display which dims

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