Got a Visio P50HDTV10A. Had it for several years with only minor problems. Now, most everytime you turn the TV on you get sound but only a brief picture for maybe 5 seconds. Turn the TV off, wait about 10 seconds and turn the TV back on and sometimes this takes care of the problem. Other times I may have to do this two or three times. Once the TV gets past this power up issue everything works fine. Is this set on it's last leg?