Step 1:
Remove all connectors from TV.
Step 2:
Connect power supply to GREX --> the light on GREX light indicator should appear.

(For complete GREX light indicator guide please look here: http://www.xdimax.com/grex_faq/faq_details.html#blink)
Step 3:
Make a connecion between your source playback device and TV as shown below: If you can't see playback from playback device on your TV, then there is something wrong with your equipment.
Step 4:
Connect GREX between your playback device and TV, as shown below: If you still can see playback on TV from your playback device, then GREX is OK.