When I turn on the TV (Pioneer PDP 4360HD) I now get a message on the screen that has a yellow triangle with a question ark in it and the message on the screen says "Starting up. Please wait" but no picture ever comes on. The TV has worked great for two years and now I can't get past this message-any ideas? Thank You! Ted

This message is generated when the data connection between the processor from the mainboard can't communicate with the internal tuner or the external AV box because either the connection lines are defective or the processor itself is faulty. Simple test to determine which: unplug all the cables from the tv (including the power) for at least 10 minutes the plug back just the power cable and start the tv. If you still get the same message then the problem is with the processor.
The power source, that is easily installable - just 4 screws and a few cable connectors, has almost never something to do with it. If it would have been faulty the effects would have been way more visible. The part that is failed in your pc is the processor, located on the mainboard- you will most likely gonna have to replace it completely.

This is a common problem, it is the power supply,if you take the back off you will find a couple of electrolytic caps that need replace or just buy a new power supply.