Loss of signal HDMI in Windows Media Center

I have a Dell Studio Hybrid PCs only running Windows Vista Home Edition Premium attached to a Samsung LN52A750 LCD HDTV via HDMI. If I turn on the TV away from the PC input and back, I lose the video signal... but only when Windows Media Center is running in full screen.

It works fine:

  1. Turn on the TV.
  2. Switch to PC input on the TV.
  3. Turn on the PC.
  4. Start Windows Media Center.
  5. Turn off the PC.
  6. Turns off the TV (or switch to a different input).

This also works very well:

  1. Turn on the TV.
  2. Switch to PC input on the TV.
  3. Turn on the PC.
  4. Start Windows Media Center.
  5. Minimize Windows Media Center.
  6. Turn on the TV to a different entry, but leave the PC.
  7. Turn on your TV to the PC - you see always the computer.

It does NOT work:

  1. Turn on the TV.
  2. Switch to PC input on the TV.
  3. Turn on the PC.
  4. Start Windows Media Center.
  5. Turn on the TV to a different entry, but leave the PC with Windows Media Center in full screen running .
  6. Try to turn on the TV to the PC - no picture or sound is on the screen and the PC must be restarted to return sound/video fully.

I came across this problem recently (after the passage of a VGA/DVI to HDMI connection). First of all, I came across it when the PC would go to sleep - the video signal stops and the TV stop see the PC signal, even once the PC is awake. I have read a bit online and thought it was something people call a problem of 'EDID handshake. " I thought simply not let the computer sleep (and do not turn off the PC video) would fix it, but I ran into another issue. Kind of a twist.

I was showing friends how Media Center worked, I spent in the PC, showed them Windows Media Center, spent in a different entry, then switched back to the PC (because I forgot to show you something). The blue background of Media Center appeared for a split second and the signal was instantly lost. I had to reload completely in order to recover the signal.

I retried the experience - shot to the top of Media Center, active the TV away from the computer, then it passed right away - same result. Restart lost, hard signal.

I don't know how I fell on it, but at some point, I had the experience with a twist. I pulled to the top of the computer, started Media Center and reduced. Then I moved the TV away from the PC and back... and the signal was always there. I did it again, and again, the signal was there. The TV turns off and on again - signal always there. Then I enlarged Media Center, changed television away from the PC, and when I came back... NO SIGNAL.

So: with full-screen Media Center loses the signal, but when Media Center is reduced to a minimum the signal remains.

I started thinking about how my recent use of the Media Center differed from the previous time. Normally, I use the Media Center, watch a movie or something and then go and do something else. I'm back from PC to something else and back. And every time that I had spent in the PC and he had kept the signal, the screen saver has been on - the screen saver 'bubbles '.

Something that I noticed with the screensaver "Bubbles" is that it sometimes brings the Windows taskbar in the foreground so it 'up' to the Windows Media Center full screen appears. I usually turn the television on the PC input before "wake the computer" and to get the screensaver to go.

Now I wonder if the lost signal has something to do with Windows Media Center. I have [I think] know a bit the functioning of Windows and the concept of execution of different 'offices '. I wrote a screensaver in C++ unmanaged long ago and I remember there was some crazy stuff that you have to do when you write an application "windowless" (as Media Center - there is no border around it when it goes full screen) and make the "caches", as the screen saver 'bubbles '. I wonder if he has something to do with the standard Windows Desktop works correctly but the Windows Media Center app full screen "desktop" does not properly.

I tried another experience where I kept full screen WMC, leave the TV losing signal and press Win + D to minimize and show the desktop. Then I went to the TV in the back. No luck - once the signal has been lost, it was lost for good.

I did since then research various responses. I read that defining the ACPI suspend mode S3 would fix it, but it doesn't. I tried implementing a keyboard shortcut attached to a script that could change the display resolution of 640 x 480 and then change back because I read changing the resolution to update the signal - which did not work.

Basically, I got no alternative except to keep WMC reduced when it is not in use.

I'll try to set the screen saver "Bubbles" to 1 minute or something and see if that will at least let me inputs turn on the TV after one minute of inactivity. Yet, it would be good to know if there is some setting I'm missing.

Hello Travis and Jmelton98,

Thank you for posting.  Your tests of Travis and additional post of Jmelton, it seems it will be probably something that only can be set by the video card drivers.  If you were to look at the known issues for some drivers, you would see similar questions types.  It is one of the reasons for the drivers for video cards are updated so often.  Sometimes there will be a problem so important that they will release a special patch to fix (like what happened during the crisis game is released).  There should be a new series of pilots soon become availible.

Please try and see if the problem persists.  Thank you both for the replies that it will help others too. Zack
Engineer Microsoft Support answers visit our Microsoft answers feedback Forum and let us know what you think.

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