Need Help LN52A650!?!?!?

[Alpha Sixx]

OK I bought the Samsung LN52A650 about 2 weeks ago with 4 year warranty. I took it home and it has a great picture. But when I put the 120hz to high, the picture is way better than my other 60hz hd tv's and almost 3D like and adds much more depth and is much more fluid with what I am watching or playing but the picture blurs and flickers when something moves faster than normal. I thought the 120hz was for faster movment. It does this also for my XBOX 360 wich has the $100 dollar XBOX HDMI cord and my PS3 wich has the $100 dollar PS3 HDMI cord and also my LG BH200 Blu Ray/HD player that I have the $160 dollar 1,000 Monster HDMI cord for. I called Geek Squad and they just transfered me directly over to Samsung, wich did not answer. I was pressed for time at the moment because I had just gotton back home from a yearlong deployment in Iraq a few days earlier and was just about to go home for leave the next day. So right now my TV is in FT Hood/Killeen Tx and I am in Houston on leave. My question is does anyone elses LN52A650 do the same thing or should I take it back as soon as I get back home? Any help would be greatly aprecciated!!!