I may have an issue with my new i7. It doesn't seem as if the sleep and screen dimming functions are working properly. Here's the problem. I want to watch a movie, or run a program like Eno's "77 million paintings" - this requires that the screen not suddenly dim, or the computer go to sleep. So what I do, is: 1)Go to System Preferences and in Energy Saver, set "Display sleep" to 3hrs, and "Computer sleep" also to 3 hours. 2)In Desktop & Screen Saver, I set the "Start screen saver" to NEVER. Then I watch the movie or run Eno's program. BUT then suddenly and randomly the screen will dim way before the 3 hours. With Eno's program, it first dimmed, and then later it actually went to sleep right in the middle of the show! I checked the temps with iStat, and they are never above 55 - at least that I saw. If I operate the computer normally, surf the web etc., I never have it suddenly go to sleep on me... but when I run Eno's program it did. What's the deal here?