We tried flipping the AV switch to both HD and regular tv. We get a flash of small white lines when the system starts up and hear the sound, but still no picture in either postion.
Ok,
Then it is a hardware issue.If you have tried the switch, tried multiple cables, and tried it ondifferent tv's and it still does not work than this sounds link theknown X-Box 360 video problem.
Red Ring of Death problem is that the GPU(Graphical Processing Unit) has a tendency to overheat, which wouldmake sense why you get no video, since this is the internal componentthat sends out video through your a/v cables to your tv. The Sound cardand motherboard probably still work, so that is why you would still getsound.
So the only solution is to get it serviced.
You can also check out the below link.Just click on it.
http://www.engadget.com/2007/06/24/xbox-360-owners-reporting-blank-video-output-issue/
Press and hold the power button again
until it shuts off again.
Once you have verified that AV is working, turn off console, take out AV cables.
Plug in HDMI cable and turn system back on. Switch TV input to HDMI and it will ask you if you would like to use the HDMI cables, select yes again and verify.
If you cannot get sound, again, check the cables..
If new cables do not work, then your HDMI output is going bad, not from use rather normal wear and tear of the motherboard.
To get the best non HD picture, you will need to get some 'component' cables, rather than the standard AV (red, white, yellow).
Good luck
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