I've run into a problem with my Thunderbolt ports on my Early 2013 Macbook Pro (Retina). Neither port will work.
I have a genuine Apple Thunderbolt to Firewire 800 adapter and a Firewire 800 to 400 adapter cable to run to the hardware. It receives no power from the Mac. I tested the 800/400 cable on two other (older) Macs, and the unit shows a link (without the drivers installed). I've also tested the Thunderbolt/Firewire adapter with one of the older Macs, same again, unit shows a link.
The only difference with Thunderbolt I can spot is the firmware version on the older Mac is 25.1, while mine is 23.4. I've tried multiple SMC and PRAM resets with no success. Any suggestions?
(EDIT) I must add that my Mac had a logic board replacement a couple of years back under AppleCare. I also have never used Thunderbolt until now.
(EDIT 2) I've tried a few more things; on the 2011 MBP, connecting via the Thunderbolt/Firewire + 800/400 cable yielded nothing. Connecting the 800/400 cable directly showed a link, and the unit showed in System Information/Firewire. Reconnecting to the Thunderbolt/Firewire retained the link status, but System Information/Thunderbolt shows no device connected.
(EDIT 3) Chatted with Apple Support. They suggested I go to the device manufacturer, or my adapter may not be genuine. As a side question, do Apple supply retailers who are not Authorised Apple Retailers? I purchased the adapter from MightyApe, and cannot find anything suggesting they are an authorised retailer.