Hello Andrew and Zaerc
First I want to thank you guys for all the help you so graciously give out to everyone in this forum. I am a fairly advanced PC user, mostly in the Windows side. I have been using Linux servers for about eight years now (Red Hat 5.2 was my first experience), and I find that LMCE is not the easiest thing to install and configure.
Ok, back to my point. I deleted xorg.conf and restarted the AVWizard, and selected 720p resolution, with the same result: the image is slighly larger than the TV screen and shifted to the left. I was actually surprised to see that the AVWizard correctly picked the Nvidia driver.
I then followed the procedure suggested by Andrew through the admin web panel with the same result (image larger than screen). Conclusion, no luck with the AVWizard or the admin web panel for 720p
Finally, I tried resetting the xorg.conf file copying and pasting the modeline from the backup file for 1280x768 resolution at 60hz, which worked fairly well with the VGA cable. I kept the DVI to HDMI cable connected. After rebooting, the image came out at the same size as the screen. I had to tweak the LMCE GUI to get it to size properly and fill the whole screen. It turned out to have a 5% reduction factor set, which I took out (with the admin web panel).
So now I have a working configuration at 1280x768 being fed to the TV through the DVI port of my graphics card to the HDMI port of the TV. Everything appears to be working Ok. The image is sized and placed correctly. Frankly, I cannot tell the difference with this setup from the previous one using the VGA port. On the other hand, my TV appears to have the same image sizing issue with 720p being fed from a PC either through VGA or HDMI.
Any additional suggestions?
Thanks again for your support,