i installed leopard last week and have noticed an annoying problem since. previously if my mbp was left untouched for a few minutes the keyboard lights would go off and the screen would dim a bit. touching any key or the trackpad would bring it to full brightness. with leopard the screen just goes black as if it's going to sleep. no dimming and i don't even see a screensaver. not sure why it's doing this as i have my settings for the display to go to sleep after 30 minutes, not 2 minutes. i installed leopard using an archive and install so all my other settings are exactly the same. why would this be any different? any idea what's going on? thanks!