I ordered an Akitio full length Node TB3 eGPU from a reputable seller on Ebay. The unit arrived quickly, and I swapped out my RX 480 that was in my 5,1 Mac Pro into the enclosure and connected it to the Mini using the supplied TB3 cable. All went well, as the system recognized the eGPU and card, and benchmarks proved a noticeable increase in performance. However, a few days later, I shut the Mini down and unplugged everything to set up my new desk. After getting things in place and re-wiring everything, I powered on both the eGPU and the Mini. Mini fired right up, but I got a black screen. Upon looking at the eGPU, it appeared that it wasn't powered on. Flicking the power off and then on again resulted in the light blinking once, the fan spinning up for a quick moment, and then nothing... fan stopped spinning and no light. After waiting for about an hour, I tried powering it on again and it worked! Everything showed up as normal on the Mini regarding the external graphics. Fast forward to yesterday and I again powered everything down in order to upgrade the RAM. After about a half hour to do the install, I powered everything back up, but again had the same symptoms from the Akitio Node... quick blip of the light and fan spinning for a moment, then nothing. Again, I waited about an hour, powered the eGPU back on, and it started working again. My question is this: is this normal for the Akitio Node TB3 enclosure? Or is there some kind of power supply issue that makes it not able to power on after heating up? Seems as though a lengthy cool down does the trick. There is a 30 day return policy from the seller on Ebay... should I put in a request? Thanks in advance.