Help! I just bought a floor model of Panasonic TH-42PHW5UZ for a cheap price, what test you should do? The guy I bought it from told me that if there is a problem with the plasma, then I can tell them within 24 hours and return it. What test should I do other than whether it turns on and off and weather inputs work? I would greatly appreciate if someone could let me know what other test to perform.