Since going mac about 2 years ago, I have not had any issues of great concern. The only problem I've had is as of late, when my computer is unplugged, the display shuts off after a few minutes even though I have the settings so the screen stays on. Its no life and death issue. But it had me wondering about regular servicing or system cleaning (software wise). I'm not overly technical in the computer area. I'm wondering if there is some preventative maintenance I can do to "clean-up" the system. All I seem to know is to use "tech tool deluxe" and manage your files. Is there a checklist of things that can be done every couple of months to keep everything in proper order?