RANDOM HORIZONTAL LINES on iMac G5 (1st G)

I have the iMac G5 (NO iSight) and some months ago I discovered some random horizontal lines that went through the whole display up or down. They are not there the whole time, sometimes when I work with Aperture or even iPhoto or Safari the lines start to appear, or sometimes when I turn on the computer. I don't think they are linked with temperature, but I do think they are related to the processor use, as when they appear I hear the fans inside, which means the more of the processor is being used. I've also tried the iMac on different homes, so it's not energy related. I got the iMac to an Apple Authorized Retailer and they changed the logic board under the extended repair for the iMac G5, but that was no luck. The lines are still here, and they don't know what is causing them. Anyone knows what I could do to get the display fixed? Any part inside? Thanks, they are very annoying.

Hey guys,
About the RANDOM HORIZONTAL LINES I don't have any good news for you. I contacted an Apple Authorized Reseller and they took a look at my iMac G5, and after sending photos of the lines to them they could actually get the logic board replaced through an extended warranty program Apple has with the logic board and power supply. However, I brought it home, and the lines are still here. It could be something with the actual display because they told me the logic board contained almost everything, so in my iMac the logic board is (hopefully) new, or at least working. I haven't tried plugging it in to another display. But I do think it is related with processor activity; when I run many applications that require lots of processor, the lines appear, and when the task is finished, they are gone, such as the Aperture Trial (lines here don't let you even see at your pictures correctly). I'll keep contacting the authorized reseller to see if anything comes up and I'll keep you posted.
Please try contacting Apple in the United States. I can't, I don't live in the US. Any ideas of solving this (maybe directly from Apple) would be great. Thanks!

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