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-First, what model "DVR" is this? if the labels or doors are missing you can determine this from the system info screen (Menu 6 -1 - 3). You should see a screen similar to the one below:
This is the system info screen from a ViP622 DVR. The HD afterwards is not part of the model number.
Second, if your dish is indeed 5 years old you are not getting all of your HD channels. If you are willing to post a more accurate location (just south doesn't cut it) we can recommend the correct dish for getting your all the CONUS HD channels and your local channels in HD (Where available). There is also a very good chance that a 5 year old dish may have some LNB Drift issues (indicated on the above screen by a red warning message about selecting details after Status: instead of the nice green "Good"), and is more than likely not compatible with the dual tuner capabilities of all HD DVRs via a single cable.