I have a Panasonic TH42PX60u build date of January 2007. It has a blank screen (dim gray) with intermittent flashes (rainbow colors) of the source program. When the picture does appear it's usually a blue bar a the top of the screen with a snowy version of the source program intermittently flashing. I tried unplugging and resetting the display twice, which worked for a day, but now the screen is all wonky again. My son was playing his PS3 on it when the screen went blank. I switched back to our DirecTV HD box, moved the cable from HDMI 1 to 2 and tried the OTA signal, but nothing helps. The TV powers on and the sound is fine. The red power indicator light is constantly lit and does not flash. If I leave the display unplugged overnight and plug it in the next day and power it on it will work continuously for a few hours. When turned off and back on later it will display properly for a few minutes and go to a dim gray screen with sound and no picture. Any ideas how I might try to troubleshoot this? Any help is greatly appreciated.