The thing about a BIOS is that you don't flash it unless you need to do something that the current BIOS can't do. If it won't let you adjust the fan speed in CCC or Afterburner, I would recommend putting it in a buddy's system to see if the fan is the same speed. If it slows down, its a driver issue. If its persistent, then its a card issue.
Try to install the drivers that you had before, when it was working.
And captjack5169, I did the same thing to my 6950, best thing ever.