SlingBox ProHD, probably four years old, WOW digital cable network, Scientific Atlanta 3250(?)HD box.
Symptoms: HD channels would stop video output. Audio would play fine. Non-HD channels would play audio/video fine. Power down/up to SlingBox would cure issue. This had been going on randomly, for the last several months.
Current Issue: SlingBox will not work in either HD or non-HD. Tried power down/up, nothing.