need help, LCD tv connected to new PC via HDMI lost signal after switching from PC to TV and back

I need help with a problem i have.
purchased a new PC intel I 7 Gygabyte H77 motherboard, Nvidia GTX660 graphics card.
The PC (GTX660) is connected to a 37" Panasonic LCD TV via HDMI cable.
Everything works fine.
When i either shutdown the LCD and turn it back on or change the source to TV and back to PC HDMI there is no signal, the only way to get the signal back is to unplug the HDMI cable and plug it back in.
I am running windows 7 home 64 bit and i suspect it might be an OS issue.
any advice?
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More about lcd connected hdmi lost signal switching back
  1. You need to disable auto detection in Nvidia Control panel so your PC will always assume that there is other Display connected.

    or use this... Open the Control Panel (Classic View). A) Click Administrative Tools -> Computer Management.
    Click Continue for the UAC prompt.
    In the left pane, expand Task Scheduler, Task Scheduler Library, Microsoft, Windows, and click on MobilePC.
    In the middle pane, right click on TMM.
    To Disable TMM - Click on Disable.
    To Enable TMM - Click on Enable. NOTE: TMM is enabled by default in Vista.
    Close Task Scheduler.
    Logoff and logon, or restart the computer to see the change.
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