If there seems to be a HDMI port malfunction on your Z7+... here is a way to see if the z7+ is actually alive.
These instructions will require you to have an android device available.

1) install Air Sync Remote-Z from Google Play Store (a must have anyways - it's awesome)
2) make sure your z7+ is hardwired to your network (Ethernet to your router [no wifi])
3) make sure your android device with Air Sync is on the same network
4) pull power from the z7+, wait 5 seconds, put power back in z7+
5) Wait for z7+ to show a GREEN light (fully booted)
6) open Air Sync and at the top will be a device selection box. Tap it and choose the device that appears - usually Living Room 1_XXXX
7) tap on Mirror Controller icon
8) if you have a display on your Air Sync device move to next step
9) on the remote press the RESOLUTION button every 1 second until 720p60 is highlighted
10) wait 5 seconds - is there now a display on the TV? If not, continue...
11) RMA your z7+. It would appear the HDMI controller is defective or the port itself isn't properly soldered.

This will get your box running if you have a green light.

thnx iconiQ "Q" and Formuler team