The drive itself works and is immediately detected by other machines, it's not a cable issue and I've swopped cables and SATA ports (onboard ports are SATA2) to check, with no difference. The BIOS does not detect the SSD drive (or any other SSD I tested with) and doesn't list it as a boot drive type option at all, it only displays USB ports as possible boot sources. I'm trying to do a clean install of Windows 10 on a new SSD (properly formatted and functioning) - motherboard is a Gigabyte GA-H61M-S2P (V3.0).
I've been struggling with this for the past few hours so I'm hoping someone knows of a trick I haven't tried yet.