I have an htpc that i built about 5 month ago with the following components Gigabyte GA-M57SLI-S4 AMD 6000 athlon x2 4gb ram ATI 2600 PRO Im connecting to a 46" plasma via hdmi. Everything worked fine for months but in the last week i have noticed a slight stutter in all mkv files, blu-rays, no matter what video format or player i use. If i resize the player screen so i can see the video and my desktop i can see what looks like flickering and this seems to cause the video to stutter. This only appears when playing videos, cant see it any other time I dont know the best way to explain it. I have tried numerous drivers for the gpu, this has not helped, i have also reinstalled vista on two different hard drives with the same result. With a fresh install of the os all i installed were the codecs needed and still the problem is there. I have a feeling it could be hardware related but i will need to test with less ram and different components. Any help would be great.