I'm new to this forum, but I am posting because I have no idea how to fix this. I was performing an upgrade on my computer, swapping out my old i5 3570k, with a new mobo and an i5 4570k. I installed the new upgrades then went into the bios and it didn't recognize my old hard drive (WD Green 2TB) but my optical drive was recognized. I thought my drive was broken/corrupted so I purchased a WD Blue 2TB and it still didn't recognize it. I thought maybe there was an issue with the mobo so I purchased a new one (B85-E/CSM) and it still didn't recognize either of the drives. Finally I thought it could be the CPU so I used a i7 4770 from a friend who got it from an Alienware and that still didn't fix the problem on either mobo with either drive. No idea what to do from here, so any help would be greatly appreciated, thanks!