Standard built in Hard Drive? That could be the problem.
Just the other day the mini began to stutter while playing movies/tv in; iTunes, DVD's and from the internet (Hulu, Netflix). I am running OSX 10.8.2; the mini is hooked to my TV through HDMI. Any suggestions would be appreciated.
I had the 2012 Mini 2.6 for a couple of weeks before I returned it, and noticed slight stuttering on 1080p movies during scene transitions, and also had moderate stuttering when closing and opening the movie back and forth to the desktop. I now have a 2011 2.5/ATI Mini, and don't notice any of those issues, so I attribute it to the HD4000.