I jumped in here to ask a not dissimilar question about the same TV with my new 555....
After fiddling around with it tonight, I have Sky HD and my DVD working OK on HDMI 2 and 1 respectively. Go to devices, and troubleshoot the TV, choose 'TV never goes to the correct input', Yes, Help fixes it, Select Input Settings, click through the power options, then through the input list and you get to the input buttons. I have HDMIs set to InputHMDI1 (and 2), and this works every time.
But (and this was *my*question)...I cannot find a button in here that will set the TV to component input (for XBox 360) - several that look like they might do the trick, but achieve nothing (and don't when selected from the remote's 'Device' buttons either, with which they equate). Bizarrely, the PC input works every time. Anyone else had this issue? - I know Panny switching has a history of being problematic, I'd love someone to jump up and tell me how they solved it.
And whilst I'm here.... am I going to have issues if I let the HD box standby overnight? Because my 'Watch Sky' activity is set to have it always on, and it doesn't wake it up if it's in standby.....