I have a mitsubishi big screen TV from 2003 and I go to turn...

I have a mitsubishi big screen TV from 2003 and I go to turn it on and it the light comes on for a few seconds then turns off
the screen never comes on is this the power supply ?? If so is it easily fixed and around how much should it cost ???

I have the same problem with my Mitsu rear projection. After on for about 20 minutes, when it warms up, it shuts down. Once it cools down and after 10 minutes or so, I am able to turn it on and power up again after several attempts. Is this a part that I can easily replace at a reasonable cost on ebay? anyone know the part# and how to install it?
I know plazmas are cheap enough that it might not be worth fixing but it's in my basement and still fun to use for video games.
thanks for your input.