Hi,
I have a P55M-UD2 with two hard drives. I'm trying to install an additional SSD (Phoenix Pro) and it's not working. I have tried various combinations of power and SATA connections, all with the same result. What's weird is that sometimes it will show up, both in the BIOS and in Windows. (I run OS X on one of the HDs, and it never shows up there.) But then if I restart, it'll disappear. Sometimes it'll give me a SMART error for the drive on boot, but not always. I have installed the latest firmware on the drive, and I believe my BIOS is up to date (F11). Any suggestions? Thanks.