Why doesn't it turn on after a power outage? - Panasonic TCP50X5 50"plasma hdtv720p2-hdmi2-usb1-component1-composite6

There is a high probability that the internal electronics were damaged as a result of the power outage. Quite often, when power fails, spikes and surges occur. These can damage unprotected devices. Even power-strip-type surge suppressors cannot always keep these from occurring. Newer electronic devices are engineered with minimum tolerances in order to assure a short lifespan. Manufacturers want you to be buying another unit in 2-3 years, so they design them to last only the minimum time, usually not much past the warranty period. To prevent this from happening in the future, invest in an UPS for your critical electronic devices. This will prevent surges and power spikes/outages from damaging the unit(s), and will maximize the incredibly short lifespan these devices have. The days of a TV set lasting 10-15 years are over, unless consumers revolt and demand better design quality. But even then, with technology moving forward as fast as it does, most of us won't want to have one of these for too long as we will be wanting the improved capabilities of the next generation devices.