I have a Directv HD DVR model number HR24/200. I am unable to record one channel while watching another. I have a splitter on the coax with one line going into SAT1 and the other going into SAT2. My settings show I am receiving signal on Tuner 1 but no signal on Tuner 2. I have reset the receiver and still no signal. I have switched the cable to make sure they were both good and still no signal on Tuner 2. None of the connections are loose. Directv rep says that it should be working, but it's not. Any ideas? Our dish itself is set up to receive up to 4 signals at a time. Only 2 are being used currently so that shouldn't be an issue.