I have a FLA-3732B High Definition LCD TV, just this week it will not bring up the picture or sound when I turn it on. At first it would come on if I unplugged it and plugged it back in and clicked the power button, but now all I see is the blue power light on the front of the TV. I changed the batteries in the remotes and I checked all the connections. Is there anything that I should do to get the picture and sound back?