I'm a first time Mac user and I just bought a 20" iMac C2D. I haven't had too many problems learning the new OS but I do need some help. I know this is a lame thread, but help a brotha out. Problems: 1. Is there any way to manually sleep just the screen? 2. I know with my PC I had to clean up the temporary files and what not to get my computer to run faster and had to run disk defragmenter. Is there any use to this on a Mac? If so where is it located or what program should I download? I know that the computer only being 2 weeks old that I don't need to do it yet, but for future reference. 3. How do you change themes/dock icons on an Intel iMac? 4. Can iPhoto compile photos/music, and burn it to a DVD or .vcd or something to where I could play it from a DVD player? Thanks. Sorry for the stupid questions.