Hi, I am trying to do a clean install of Snow Leopard and having a lot of headaches. I have two SL DVDs, the one that came with my mid 2010 macmini (which is 10.6.3) and another copy that I purchased to install in my other macs (which is 10.6). Here are my problems: 1) In my mid 2010 macmini, I can only boot from the DVD that came with the computer. I cannot boot from the retail DVD, even though they are both SL. The only difference is that the retail version is a slightly older version, but the same OS. 2) The reason I want to boot and install the retail version is because I already installed the included one and it is not behaving very well. For instance the graphics seem a little slow and I am having problems to log in another mac's screen sharing. Any help getting the retail version to boot? Thanks!!!