I feel your pain bro. I had to return two boards for the same reasons you’re describing.
I requested and received the third board tested to bios and it’s a keeper.
I believe Asus had some quality control issues with the first run. The first board would light up like Christmas tree (all led’s on red orange green) when powered up, the second ones led’s appeared normal (all green) both boards would not post to bios. I tried three different vid. Cards, two brands of mem, two power supplies and two CPU’s. All this was back a month ago early in the release and I was assuming the problems are behind them now so don’t give up yet if you need CF setup.
This board is rock solid, OC’s nicely and have gotten some descent scores. You could imagine the grin this setup gives me over the DDR1 939 system I’m upgrading from.