First post. I had managed to get my Hackintosh working near perfectly for about a month, . Shut it down on Friday, started it the following day got monitor out of range error.
After much faffing around went to a time machine backup (reinstalled chameleon 2 of IATKOS disk) same problem. Actually swapped the graphics card to one identical - same problem. Tried aquamacs installer creating EFI string (verified by another posters EFI string) still getting monitor out of range. If I remove all the nVidia kexts it boots into 1024x768 mode it works as you would epect. Its so weird. Ive a feeling its now something to do with cameleon.
PS Tried my Samsung telly where I saw flashes of video output and mode not supportred.