I apologize for the rudimentary questions but I've recently adopted Mac after being fed up with Vista and am trying to learn my way around the Mac after years of Windows habits. My first question is what's with all the Libraries?!?! If I open my Mac HD, I see a Library directory, then another Library dir under System, and yet another under users and my name... What is the difference between all of these, when will I need to access each, and why in the world aren't they called different names? My other concern is this business about caching. I've been having display problems with my brand new Mac Pro (which certainly didn't help the transition from Windows after leaving Vista to try and get away from weird crashing) and it has been recommended that I do a few things like clear my cache, repair disk, repair permissions and probably other steps that I didn't remember or understand. My point is, it sounds like there are some very common steps Mac users take when they run into any problems with their computers (such as cache clearing, repairing, etc.) and I could use some clarification on exactly what these steps are and how to perform them. I started looking for cache to delete and found my endless supply of libraries, which is where my confusion began. The biggest thing is I want to solve this graphics problem. My guess is it is video or RAm related but I've heard all sorts of possibilities with bad logic boards, PSU, etc. Any help on 1) getting me to better understand the folder structure on Leopard and 2) how I should go about finding my graphic problem would be immensely appreciated. Thanks!