If you can see the boot sequence, that means that the hardware is properly sending, and the television is properly sending. When it enters "Vista mode", the hardware is no longer transmitting to the television which usually indcates a driver issue.
You want to make sure that overscan is at 0%, and that you have the latest drivers.
A couple of weeks ago I purchased a LA55A950 Samsung LCD TV. I've been very happy with it but have hit my first real hurdle.
I'm trying to hook up my Vista Media Centre PC to it via HDMI and getting a dreaded "Mode Not Supported" message. I've read the manual and am at a dead end.
AMD Athlon 64 X2 4400+ Dual Core AM2
Asus M2A-VM HDMI AMD 690G
Integrated Radeon X1250 Graphics, HDMI, DVI, Component Outputs, S-Video
Microsoft Windows Vista Home Premium 32-Bit
Important to note is that I get visual when I hook the PC Via the PC in (15 pin SVGA) port but obviously no sound.
The manual has specified that I should use 1920 x 1080 @ 60Hz, which I have done. I'm also using Port 2.The HDMI input seems to work for a few seconds at the start of the PC's boot sequence but stops when the PC enters "Vista Mode". The only thing im not sure about is the manual says Interlace mode is not supported, and I dont know what that is.
I've seen a few similar threads in this forum but all seem to be aborted before completion. I promise, when this is resolved this thread will be updated with a solution.
Any assistance is greatly appreciated.