Ok, give us the details about your system. What parts do you have?
On my board, FF means it's done POST'ing and is handing control off to the operating system (I have an Asus A7V333-R which reads the codes out on a front display). So FF is what you're probably going to see when the board is fully operational too. Don't get anxious just because it says FF.
My suggestion is to take the board out of the case and lay it on the antistatic bag. Next, get a large hammer, and threaten the board with it a little.

Now set the hammer down within view of the motherboard

and plug in one memory module in the slot closest to the CPU, as well as your video card. Make sure the CPU fan or another RPM-signalling fan is plugged into the CPU FAN header so the board gets reassurance that
yes, the CPU fan is running, I can continue POST'ing (some boards will not run if they don't see RPM input on the CPU FAN header). Plug in the ATX power connector and use the tip of a screwdriver to momentarily connect the two pins for the power switch, and see if you get video on your monitor at this point. Post back with your results on this.