If your rig was tripping the surge protector, you need a surge protector that can handle more power. Most of them should be able to handle 1800+ watts.
You should be able to get close to 170-180 with 6 Gaming X cards.
1) Firstly, unplug all your cards.
2) Start up, go into bios, and disable 'Above 4G Encoding'
3) See if it boots via the onboard.
If it boots:
4) Use DDU and uninstall drivers
5) Turn off, plug 1 card in, install drivers.
6) Plug 1 card in, reboot
7) After you plug in your 5th card, you should get error 12. Restart and enable "Above 4G Encoding"
Repeat until all 6 are added.
9) Profit
If it fail to boot after step 3, you might have another issue. This happened to me when my GPU wasn't seated all the way in the riser, or something wasn't plugged in correctly.
If plugging in the card doesn't work, rebuild the entire machine. Take out all the power, plugs, SSD, everything. Plug 1 item in at a time until something fails. This is normal PC troubleshooting.