I have some screen grabs that I'm using for my desktop. Som are small but some are almost as big as the screen. When I set it to tile the images, when it gets to one that is a larger size it turns the outside parts of the image to stripes. Not only that but if you move a page around on the screen it makes more lines, almost like it's pushing them around.
The reason I'm concerned is my computer is only a year old and a few months ago it crashed while streaming video, the whole screen went to vertical stripes and I heard a clicking noise. It wouldn't respond to any keyboard reboot, I had to hit the power button to turn it off and I heard a loud pop. When it booted again I ran disk utility and it didn't find anything serious. It hasn't happened since except for this desktop stripe thing that is happening. I remember my powermac years ago would tile the image around the large image, it would not stretch it to stripes. Anyone have any ideas if this is normal?