Rich just upgraded to DISH Network's Hopper, but is only getting a green screen by HDMI connection. Leo says that it could be a copy protection issue and recommends trying a different HDMI. It may also be that Rich's TV doesn't support HDCP, and the Hopper is HDCP compliant. Also, he should make sure he's plugging the cable into the proper port. The port or cable could be bad. Try the easy stuff first. Then contact DISH.
JeffC suggests getting an HDMI composite converter from monoprice.com to get around HDCP, but Leo says that will degrade the signal significantly.