said by nss_tech:
I know it's likely not the cable but these boxes have a history with HDMI issues. Do you have a spare cable to test with?
Here is my setup:
1. SONY TV --HDMI Cable -- STB PVR --Cat5E--Actiontec
1. LG TV --HDMI Cable -- STB Player--Cat5E--Actiontec
All HDMI cables are v1.4. Change HDMI cable has no effect.