I have a desktop mac and a mac notebook. They are both outdated I guess. They still work of course, but crash a lot, slow, and sometimes a sign comes up telling me this is outdated. I restored several times over the years by CD's I had, not really knowing what I was doing I know, not smart..... So, they both are described the same: Laptop and desktop Mac OS X Version 10.5.8 Processor 2 GHz Intel Core 2 Duo Memory 1 GB 667 MHz DDR2 SDRAM I would like to bring them up to date and I feel they are worth saving as I am not a heavy computer user. Maybe an hour a day at the most and I don't do much except forums, a couple chats, research and youtube, etc. I don't think I used the notebook more than 50 times since I bought it. Would someone please give me instructions how to update? Do I just buy a CD called snow tiger or something like that and install it? Can I just jump to the most recent that is out. I think it is called Yosemite? Or do I have to buy each disc to bring me up to date? Or do I need to send these to the junk yard and buy a new mac? Your help will be appreciated as I really do need it explained to me so I can understand. I am not completely stupid, but I am not computer savvy either.