So I put the power supply jumper tool thing on the 24 pin cable after I removed it from the motherboard, plugged in the power cable, flipped the switch and then hit the power up button..and it sprang back to life.
I have a 1 month old 2080 Super in my desktop rig I can swap to this unit or the old 1080 FTW that came out of that old desktop rig.
Is that the next thing to try?
Again my thanks to you guys as I've never had anything like this before so I'm sorry for the noobish questions.