Hi All, Hi bilabonic

Its the seller of this S7 BTC miner here.
The unit is (should/was/tested) working well, hope the video walk through was followed to ensure it is all connect up properly.
the usual pin 3+4 on PSU (850w and RM1000w one) should be in place, do ensure it is in place, and not peeled back, or pin fallen out.

walk through of my setup(testing) pre-shipping.
https://youtu.be/byicTWp7r1g

my S7 setup, pre shipping again, -all about power supplies connections
https://youtu.be/urkXA2ShCd4

Bear in mind the RM1000 has the modular cables, in case they are not plugged in properly?
Have them meter-tested post power on, to ensure they are correctly plugged.

I am scratching my head here, not sure what the issue you're experiencing there to be honest.
Do you mind posting here photos and video-walk-through of your setup by any chance as well?

that would help set any assumptions away and get us all on the same page there.

cheers