Iam having problems with picture quality,doesnt look like in the store.

What are you connecting to the TV using that HDMI cable? Do you have cable service or satellite TV? We had a similar issue...we have DirecTV and found out after we got the TV home (and the picture looked lousy) that the satellite receiver was analog, not digital. And DirecTV wants to charge us all kinds of money (and extend our contract) to make the switch! Thank you, but we'll make do until the contract runs out in a couple of months and then switch to cable.