I found this in a manual pdf:
TROUBLESHOOTING
Your
HITACHI Plasma Television incorporates advanced power surge protection technology designed to protect
against component or circuit damage due to external or internal voltage power surges.
IF YOUR TELEVISION SHOULD APPEAR TO HAVE A LOSS OF POWER, PLEASE FOLLOW THIS
PROCEDURE:
1. Press the
POWER
SWITCH (ON/OFF
SWITCH) once.
2. If there is still no power,
wait 30 seconds and
press the POWER
SWITCH again.
3. If there is still no power,
unplug the power cord
from the wall. Wait 30
seconds and plug the
power cord back in.
Press the POWER
SWITCH again.
This protective technology
should provide for years of
lasting entertainment from
your HITACHI Plasma
Television.