I tried retuning my Samsung UE32C6510 today (first time after the digital switchover in my area). Initially, only 17 channels showed up. So I decided to retune my TV. Since then, either none of the channels are showing up, or they're coming scrambled. At one stage, only the 4 HD channels showed up. I tried unplugging the TV & antenna cable for 30 secs, & even doing a factory reset (by pressing info, menu, mute, power in sequence with the TV in standby to go to the services menu). No joy so far.