Flashed my 680, I now get the Windows 8.1 bootscreen, but my OS X bootscreen seems to be outputting at an unsupported resolution as my 1920x1080 monitor just displays "Resolution out of range" until it gets to the logon screen.
Have tried resetting PRAM & SMC, changes resolutions back & forth in OSX itself, all to no avail.
Any ideas?
Using it in a 2008 MacPro 3,1 and running Mavericks 10.9.4.
Given that the system boots in <10 seconds, it's not a big deal, but it also means I can't see the boot selection screen although I can use it blind and it does work.
Edit: Nevermind - the GTX680 boot resolution (whatever it may be) isn't apparently supported by my monitor, plugged it into another monitor and the bootscreen appeared as expected. Strange given that OS X itself displays just fine and the 8800GT it replaced also displayed correctly on it. So there you are.
Tried editing the com.apple.Boot.plist file and specifying a known supported mode, made no difference, not sure if it even should.
Good excuse to buy a better monitor.