As the title suggests I have a Pioneer 434HDE that turns itself off. This occurs within a few seconds of turning it on. The picture is established on screen for a couple of seconds before the green on indicator on the media box starts to flash and the screen then shuts off. The green indicator flashes for eight times before stopping for a couple of seconds before repeating the cycle again. The only way I have found to get the screen to work is to turn the Media box off via the on/off button and try again. So far this has worked. Initially this happened sporadically but from Friday evening it occurs every time I turn on the Plasma. It's not particularly warm in the room and the media box is installed as per the recommendations in the manual. Any ideas? This is really annoying me especially as this is the second media box I have had. The first replaced due to a clock issue.