You can say that both of your GPUs were working in crossfire (AMD) or Nvidia-SLI (Nvidia) and as soon as you updated to new drivers, something went wrong and both of them stopped working.
470! Brilliant. Thank you. I really had just updated Crimson too. From 16.5.2 to 17.1. Something like that.. machines dead so I can't confirm.
They are bios modded.. I can't reflash them because they are dead. Fans spin and I think they showed up as hidden in the device manager. If I removal all risers and place just one card on the board I get a red gpu light and nothing.
Maybe they wont notice or wont care.
Thanks well in that case I better try to reflash them!
Fingers crossed!