I tried resetting NVRAM today, and now I get nothing on my screen. After holding the sequence of keys until the second chime, I let the keys go, and soon after, I hear a third chime. Now I get nothing on my screen. I tried booting Safe Mode, but since I'm using a PC card (GTX 760), there's no way to tell whether I did it right or not. I still see a blank screen. Not sure if it matters, but I'm using a Mac Pro 1,1 running Mavericks 10.9.3. Also, my monitor/TV only supports resolutions up to 1360x768 or 720p. This sucks. Any ideas? Thanks. Shogun.