I've encountered a strange noise when outputting hdmi in 1080p/i or 720p to a monitor. I checked the cable, monitor and record on the camera - all of those are working components. The HDMI out, however, produces kind of a speckled white noise. It's not moire, and it changes when I adjust shutter speed, gain/iso, aperature, output modes, etc. If I output HDMI in SD (480p or 480i) or composite it disappears.
Also, I tried a 2nd FS100 and did not have this issue when using the same equipment.