Could be the power bar, could be the cable.
I would wait to hear back from the seller.
Here in *theory* taking it apart and checking the cables should not invalidate the warranty since you do have to pull miners apart now and then to clean out the dust.
In reality, since you bought it from a reseller through Amazon, they can make any rules they want about what you can and cannot do. I would wait to see what they say.
If they don't respond or fix it for you get Amazon involved as early in the process as possible.
-Dave
They sent me a video on how to remove the upper housing to check the contacts for the connectors.
I am going to do that, and if it does not solve the issue, I hope they will send me another miner. Till now they were very friendly.
I hope it is a loose contact due to the transportation. It worked for a short while, and I had awesome hash rates, but very short.
In case they try to pull my leg, I will involve Amazon soon enough.
Thank you