QUOTE
That's a kernel panic
Well, there certainly is the 'kernel panic' window showing. But, unless that window was mentioned earlier, this is the first time the screen problem and a kernel panic have been linked. And I'm not sure we can positively connect one without the other. Kernel panics are so rare that it seems rather difficult to say what caused it when it cannot repeated on demand. It may be completely unrelated to the screen problem.
I think the image
does what the screen problem
Daryl has been trying to explain to us. Of course, that really doesn't help define the actual cause...I haven't seen anything hat has ruled out hardware (heating) problems. I just find it strange that the OS would suddenly go berserk dealing with its video hardware. But I was wrong twice this yeer, allreddy!

Let me see if I can possibly clear up some of the possible confusion.(Most likely caused by my inability to explain things clearly) The symptoms began when the display started getting strange horizontal lines, and blocks of pixels(??) appearing at various places, and the whole screen jiggling. The mouse was inoperable and holding down the power button did not shut it down. I had to disconnect the power. The next time it happened I WAS able to "restart" from the menu it worked for a while then did it again. (I started thinking heat) I turned off the energy saver and put on a random screen saver and it ran overnight then sometime the next day it did the "Kernel panic" thing". I booted from the back-up drive and in less than a minute it did the Kernel panic again. (that is when I took the photo). I then did a clean install of tiger 4.0. While it was installing the screen again had the "blocks of pixels" all over the screen during the entire install. When it was done and I restarted everything appeared normal. Next I did the upgrade from the Apple web site. Appeared to be normal. Attempted to launch ITUNES and got an error message saying "Itunes" needs a newer version of QT to run. it did not launch. I then downloaded QT 7.5.5 from Apple.(When I checked the BU disk 7.5.5 was there so I must have upgraded it sometime earlier) As soon as I installed it the display began its hula dance. I immediately trashed everything that Spotlight indicated as QT. Restarted. It has been running fine now for 2 days.
I erased the BU, and using SD made a new one. Now both disks are without QT. If all stays status quo, later today I will attempt to re-install QT.
In my own simple mind I now do not think that heat is/was the problem. If it were like the golden/ olden days of OS 9 I think an "extension conflict" would have been where I would have started looking, but with os x I do not have a clue. TS to the rescue?