PN58B650 600hz plasma with horrible motion blur

[bodyrocka03]

I have a Samsung PN58B650 that purchased around 3 months ago. I use a
PS3 as my Bluray player and such. I have it hooked up through a Onkyo TX-SR605. I've been having issues with motion blur on both Blurays and Games. Its to the point where its almost unwatchable. Particulary bad on parts of a scene with bright colors on a deep dark back ground. Movies like UNderworld are painful to watch because the whole theme is dark. The PS3 is connected via HDMI through the reciever and outputed to tv. I dont think its the reciever becasu i tried hooking up the ps3 direct with the same issue. COuld it be a flawed TV, a bad HDMI cable, maybe just the settings? ny help would be greatly appreciated. Thanks!