Trying to assemble and run a new rig. Have installed Ubuntu 16.04, GPU drivers, set up 1st card - works fine, mining fine.

Now whenever I add 2nd graphics card - unable to load Ubuntu, getting a screen with errors. It seems that only 1 pci slot works.

https://preview.ibb.co/bY4bCm/20171127_170615.jpg
https://preview.ibb.co/dxBL56/20171127_172055.jpg
https://preview.ibb.co/h6ejXm/20171127_172828.jpg
https://preview.ibb.co/ghKjXm/20171127_172933.jpg