I have a gateway GM5485E desktop computer which seems to not allow more than one hard drive. The original one went bad, so I hooked up my backup as a primary and been fine ever since. Well im running out of space, so I added a new one to add more space. Here's where the problem comes in. The motherboard only find's one. Ive gone through EVERY sata port and still no luck. Is there something in the bio's I am over looking? I currently am running windows 7 x64 also. Any help would be appreciated!!!