Trouble getting new Kingston SSD showing in BIOS - Aurora R3

Current System is Aurora R3 i7-2600, 8GB RAM, 875W PSU, R9 390 Graphics, 120GB SSD (Windows 7 boot drive) on SATA 1, 1TB HDD on SATA 2. I am attempting to install a Kingston 240GB SSD onto SATA 3 and it wont recognis the disk in Windows or BIOS. If I disconnect the 1TB Drive and put the 240GB on SATA 2 it recognises in Windows and Bios so the drive is confirmed OK.

Why won't it show up in Windows or BIOS if I connect to SATA 3 or 4. I can't see anywhere in the BIOS where you can turn on SATA ports

Historically I did have this working on SATA 3 a few months ago but Windows kept popping up a message something like "new drive detected blah blah" i would press ok to remove the popup box and it would just keep poppig up. I thought it was the 525W PSU that was causing me issues as I just intsalled the R9 390. I then installed the 875W PSU last night and though to reinstall the Kingston 240GB which doesn't get recognised now.

Anyone have any ideas?