I am posting this in the Windows forum rather than the HTPC forum as I see this more a Windows issue.

I have just replaced my existing Sony TV with a new Samsung TV attached to my HTPC.  Now every time I turn off the Samsung connected to my HTPC via HDMI, Windows makes the hardware disconnection sound.  When I turn the TV back on, the resolution in Windows Media Center is wrong (too low) and I have to close and reopen WMC in order to correct it.  This never happened with my Sony TV.  I also leave my HTPC on 24/7.

Any ideas on how I can fix this issue?