Hey, I'm now having this exact same problem with my Canon A70, which I bought in July 2003. I will sometimes get the black screen with purple lines, and the photo taken will show that same thing. Previous photos taken without that show up fine on the viewer. And if I tap at the camera the black & purple goes away... but it comes back again later... and seems like it might be pregressively getting worse. I'm wondering if you or anyone have resolved the issue yet or if I'm going to have to get the camera repaired by a professional.