On Saturday afternoon the HDMI output on a H2K went black, no picture or sound. I tried several resets and swapped cables with a Joey - still black. The RCA and component outputs were OK so I switched to component and ordered a replacement Hopper which will be replaced thru a tech visit. Yesterday as I was switching TV input sources to change the clock on the DVD player I went past the HDMI input the Hopper was connected to and it was working again and continues to work today. I think I'm going to cancel the appointment but before doing so I was wondering if anyone here has experienced a similar problem and what they did.