Julian, I also have an upgraded 450. Sonnet 1.2 -- 1.2GB -- 120GB 8MB 7200 -- 32MB video ram. And the Black Cat. The short test runs fine and the extended test fails on the Logic board test. My guess is that the Software that is now several years old had not been conceived to detect 1.2 processors. (Since the original Cubes were 450 and the next gen were 500.) Images can become corrupt if you look at them wrong. Enjoy the speed bump and get on with it. Dan