This usually means you have a problem with the Single Wire Multiswitch (SWM), or its Power Inserter. Do you have other DVRs/Receivers? Are they working normally? You can try swapping a "good" Receiver/DVR with this "bad" HDDVR to see if the problem stays with the DVR (it's defective), or if the problem stays in that room (problem with satellite coax feeding that room). Let us know what you find.
*The views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.