I have experienced exactly the same problem: Pressing F2 during startup will freeze the machine, F7 and F10 work.
I am habitually using my Monitor via the Mainboard's Display Port. After reading Karthriks post I tried connecting with DVI and unplugging the Display Port. Thankfully I managed to enter the Bios via F2.
Please note that this has not happened with earlier BIOS versions. I have first experienced this with 0325. While Trying to debug, I upgraded to 0326. However, the problem persists: Impossible to enter the BIOS via Display Port.
Problems like this and constant other troubles with USB is what truely frustrates me with this board. Almost a year after reporting, there is still no fix. Truely, truely sad, Intel!
Please do something!