Hi there all, After my previous post about upgrading my 3,1 Mac pro, it's finally together but having issues. Ram and SSD install went fine, along with installing el capitan. I still have my old HDD connected (with snow leopard) incase of any issues so I could boot from that. The issue has started after installing the gtx680 graphics card. When trying to boot from the SSD, I get a no entry sign for a few seconds before getting the apple logo and progress bar. The progress bar then gets stuck halfway. The gtx680 is a flashed pc card, booting from my old HDD works fine. SSD booted fine before the GPU install. Any thoughts?