Just got my Samsung PS51F5500 last week. But before I can start watching movies from the TV, it's already experiencing restarting issue.

Everytime I turned on the TV, after a few minutes, the TV would hang and go into the signal searching mode, totally can't do anything else besides switching it off.

Called Samsung customer service and they came, after some inspection, the Samsung guy told me the motherboard is faulty and have to order a new one to replace. He said have to wait for at least 1 week for the new motherboard to arrive.

Called the shop where I bought the TV from and asked for a replacement set. And he is now dealing with Samsung and he told me that Samsung is arranging a new set for replacement.

Very very bad luck buying a faulty unit. Now waiting for them to settle the problem. Hopefully everything will go accordingly and I can get my new set soon.

Just sharing my experience with Samsung.