The dvr function doesn't seem to be working. I

More than likely, the internal hard drive has failed. I have had this happen to me. I would first do a hard reset, that is unplugging the unit and leaving it unplugged for at least 20 sec. Plug the unit back in, and let it power up. This will take a few minutes to locate the satellites and download the guide. If you still cannot use the DVR after a hard reset, most likely the hard drive is a goner. You can still use the reciever to watch T.V., but you will not be able to record. There is no point in trying to replace the drive because it would cost you more than you would spend to replace it.