I guess I will try to dust it, but it hasn't been in operation that long since my brother got it. I had it for awhile, then I did some stuff with it, usually it wasn't powered on, just sitting around. HSF is only about a month old or so, the video card less than that, I don't thin problematic dust could accumulate that fast on that stuff. The case fan is new as well. Now I got the PSU with a 120mm fan on it that is also brand new. I guess it's worth a try though. The only things I can really do now is take out the wireless card and see if it fixes it, test the Celeron in it, or dust it, short of getting a new mobo.