Hi Bill,
Don't give up! You're almost there!
As has been mentioned: make sure you have a good cable. Some are charge-only. That could stymie you right there.
Make sure you're providing enough power. If it's not drawing excessive current, give it a little closer to the power you built it for.
Building errors are easy to make and common, especially on the QMX mini. These errors often escape builders' notice, even on examination.
There are lots of voices willing to share wisdom on this forum if you want to continue your building efforts and finish the job.
If at some point you decide you've reached the limit of your own patience, you can find contact info for Jeff Moore W1NC on his QRZ (.com) page. He offers skilled repair in the U.S. for the QRP-Labs line of devices.
Feel free to search the forums for ample testimony (including from myself) of his skill and generosity. It's a challenging build, and he provides a gracious back-stop to less-than-expert builders like myself.
73 de Todd W2TEF
Todd W2TEF