DX79SR VS OCZ Agility SSD

I have a DX79SR with I7 3930, gskill ripjaws 32 gig, OCZ 520gig Agility IV SSD. I originally had OCZ Agility III 480 gig SSD that worked for 6 months then intel DX79SR bios could not find it, but 4 other computer brand mother boards found the drive. So the OCZ drive was working but not in Intell DX79SR. I went through intell and tried 3 different DX79SR Mother boards and same effect they all could not find the OCZ Agility III or IV SSD but it does find all different HDD drives. Is it Intell DX79SR or OCZ Agility. Any ideas that can help, I just get run around from OCZ and Intel.