Let's start over from the top.
Shut down your machine, and only hook up via the DVI port. Boot the machine. What's listed as your vbios revision?
Boot to runlevel 3. Do you get a console?
Edit your XF86Config-4 file, and comment out *all* nvidia driver options. When that's done, add 'Option "UseEdidFreqs" "1"'
Take a look at your HorizSync and VertRefresh - do they make sense? Are they too high? If your panel doesn't offer EDIDs, these values will be used.
Start plain X (ie: 'X'). If it fails, post the log.
Have you tried small resolutions? (640x480 only?)