So, Apple repaired my Powerbook, and I got it back today, only it seems to have developed a weird quirk. It randomly seems to dim the display two bars just for the heck of it whenever it feels like it. I've unchecked the option to dim the display before turning it off in Energy Saver control panel, but it still does it. Oddly enough, it'll sometimes only last a second, and turn itself back to full brightness, and other times I have to manually up the brightness again. Does anyone know what could be causing this? Apple replaced the logic board, the DC-in/sound board, RAM, and added "new cabling" inside. I did a clean reinstall of the system immediately when I got it back, and this problem developed a few minutes after I had done that. Any ideas?