790i user here also, I so want to throw them out the window at times.
A board I was using for my main rig sometime ago with a QX9770 started to give me that same problem. I had to perform major jump starts on it to bring it back alive.
Take everything off the board, but the CPU and main power connectors.
Remove the battery
Set Clear CMOS jumper to clear
This is an attempt to get the BIOS LCD to display something other than FF
This would work for me and I would get beeps and a different error code, that was a good sign I had jump started the board with a different error code.
Now put back in the battery and hit reset button, if all goes well you should not get the FF but a different code.
Reset the Clear CMOS jumper and try again.
If all goes well from here add the rest of the equipment, GPUs, HD's etc.
The board should now post.
This happened to me many times, usually in the morning on first boot up and when I had a stack of work to do right away, it's like it was gunning for me LOL.
This was the only way I could get it to post when no matter what I did I would get a FF and no boot.
This board still works today and I am using it now. It still acts very strange from time to time and makes me want to smash it with a hammer, but I don;t give up that easy HAHA, either that or I like to have nails punched throw my finger nails.
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