Hi Andy
WElcome to the forums and congratulations on your purchase, the Samsung is a nice tv with a little tweaking.
The problem, is probably just a damaged circuit board. Was the Tv bought new, by that I mean, could you not just get the reciept from where you bought it, and then say it was dmaged during transit, and the company does not warranty the tv, and then call Samsung and execute your warranty with them. That could potenially save you a fortune.
Just a thought, as I done this with a trintron before that got damaged in transit,( nudege, nudge,wink, wink,lol

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and Sony fixed the tube, and replaced the casing. All I had to do was present them with the receipt from where I bought it, and no one else had done the warranty, so the serial number was clean.