I've had the same problem. It sometimes works, but much of the time I get the error message. I have the 2017 Roku stick as well. I would love it and recommend it if only it didn't have this issue!
We just had this problem. We reversed the cable connector and it's now working. But not taking any chances...we're ordering a new cable.
You reversed the HDMI cable? I wouldn't think that would have any affect on the low power issue, but stranger things have happened.