Turned on tv with remote (this turns on cable box and tv). TV came on for a few seconds and then went off, no picture, no sound. Remote would still change channels on cable box, so it is obviously the tv. It is a Panasonic HD projection tv. Any advice?

You need to turn on the cable box again. Make sure to select the right source again for your tv.

My sharp does the same thing. Cable box needs to be turned off for tv to turn off

your cable box is probably turned off.
Verify the cable box is turned on then press source until you get your picture back

Does it only happen when you use your Xbox?

Try pulling the cable in and out between the TV and Xbox

The good news is that the "No Input Signal" message means that your TV is not broken. If you are trying to watch cable, then you have simply turned the TV to the wrong input channel. If your cable comes into the Philips using a coaxial cable wire, use the Philips remote to change the channel to Ch.3 or 4 - whichever channel you normally watch cable on. Make sure the cable box is turned on if you have a cable box. If the cable box connects to the TV using another type of wire, use the Ch+/- on the Philips remote and go through all the AV channels until you find the right one. Good luck! Let me know if you need additional help.

-Tha Mp3 Doctor

Sounds like your on the wrong Input, make sure the cable box is turned on and press the Input button on the remote till you get a picture.

Look for a "PIP" (Picture In Picture) button on the remote or in the TV's menu. I suspect that it has been pushed but there is not a second source to view. That would explain the smaller version in the corner.

Unplug it for a few seconds and
plug it back in if this doesn't
do it the call in a technician
may be HV or PWR Sply problem

I just called Vizio and they said to unplug the TV, then physically hold in the power button on the TV for 2 minutes.

You can try this on the remote in standby mode, meaning tv plugged in but set off. Press Display,5,vol+,power on remote.Press each button within a 1 sec interv. Next the CRT display the item being adjusted. Press 1or4 on remote to select item. 3or6 to change the data. Press Muting then Enter to write into memory. Service Reset muting green enter red. Press 8 then enter on remote to initialize. turn set off to exit. wait least 10 sec. before turning back on.