Please post me a image of CPU-z Memory Tab, that will show your ram speed (NOT SPD Tab). If it matches EasyTune then you are running your ram at 800Mhz not 1066 >>>
You would have to downclock your CPU to 1Ghz or less to see the post screen, that is a good thing. You could always disable Full Screen Logo in the Advanced BIOS page, that should show you some more info.
I would assume though that EasyTune is correct and you just did not set your memory multiplier correctly
Since you did not post your specs, I will assume at least that you are running a stock 1333 FSB CPU which would mean your FSB is 333. So you need to set your ram multi to 3.20B for 1066Mhz ram speed. If you are not running that speed or type of CPU then let me know and I will help you further