My Sanyo PDP-42H1AN will power on, the screen will flash for just a second, then no picture. After about 10 seconds it powers off. Occasionally, instead of powering off the green light will blink steadily. I can connect and talk to it via Null Modem cable (while it stays powered on for the 10 seconds), but cannot change inputs or anything to get a picture. I'm looking for a true answer to how to fix this, and would appreciate someone taking the time to help pinpoint the issue (not just saying "take it to a technician") Please help!