i have just got the asus sabertooth p67 rev 3 mobo and im having a problem with one of my hdd drives. I set them to ahci in the bios and the 1 I installed windows 7 x64 onto shows up fine when i click my computer, the other does not even though it is listed in device manager. Ive tried connecting to all the sata slots yet the samsung hdd drive still will not show when i click my computer for any of them. i hava a 900w psu and both hdds are getting sufficient power so im clueless as to what is the problem 

Healthy partition and all that crap, thats the part you need to click on. (Obviously not on your C Drive though