Hi, I am new to this forum so hallo everybody I was trying to find an answer to described below problem but couldn't find any. I am using new Mac Mini quad core i7, 2.3 ghz, 4gb ram . Brilliant machine however... This morning I got a post with 16GB ram memory (from ebay) After installing it computer or rather screen starts to behave weird. After about 20-30sec all screen was covered with strange colorful marks, computer got frozen and all system went down...then restarted without my intention. I am back now to my original 4gb and all works great again. Any idea what is wrong? is it a new RAM problem? (below is the image of the frozen screen) http://tinyurl.com/cjkgkkz thank you!