Hello. I just had to chime in since I have the same issue with my PT-AE2000U Projector. I'm sad to see in over a month, nobody can help you. I'm very sorry but I don't think I can be much help either since I still have not fixed the issue yet myself. Today I'm goning out and buying a DVI to HDMI cable to see if that works. If you have since found a solution, I would like to hear it. Here is my situation:
720P looks great first of all.
On XP, I can only display 1080i @ 30Hz. On my Vista, I can't correctly display any 1080 video. On both XP and Vista, 1080P displays crisp but it's horizontally smashed to almost a 4:3 ratio. On XP, 1080i looks good but I can sort of tell it's interlaced. This maybe the combination that it's interlaced and @ 30Hz. On Vista, I tried 1080i @ 30Hz, 1080i @ 60Hz, 1080P @ 30Hz and 1080P @ 60Hz and none will work correctly. My projector does support full 1080P up to 60Hz. Two days ago, I installed Windows Media Center and I though it was displaying 1080P but when I looked closer, instead of 1080P being smashed to a 4:3 ratio, it was streatched off the screen. So I had to take the mouse and scroll over to the right to see the clock. Almost like the PC was displaying in 2200X1080. I can't be more frustrated.
I've looked through the Nvidia software over and over. I've tried all the profiles in the advanced section of the "customer display resolution." Can't find a driver on the internet for the projector. I've tried a refresh rate of 59.98 which did not work. So, I'm out of troubleshooting energy. I've been working on this for some time. Good luck if I don't hear from you.
My PC Spec's are:
Mobo: Gigabyte GA-N680ISLI-DQ6
Processor: Intel Dual Core Duo e6700
memory: 2GB RAM in Dual Channel Mode
Video: 8800GTS 512 G92
Sound: Turtle Beach Catalina
500 Watt Power Supply
Display: Panasonic PT-AE2000U