A lot of times, this (flashing orange light) means the hard drive is dead- an easy replacement. There's some sources on ebay that will sell you bigger, better hard drives already set up with TV software (for around $120). You just swap out the old one for the new one and you have what may feel like a brand new TV. I've done this twice (2 TVs) and the faster drives do make a difference. It's not a difficult job; the hardest part is carefully removing the rubber boot on the bottom without tearing it.
Sometimes the orange flash means other hardware has had it, so this isn't a sure thing. But, in my own case, it's been solved by doing this... more than once.
I suspect the heat combined with the "always on" (never sleep) nature of the TV just wears out hard drives faster than necessary.