is my HDD dying?

[Kaldskryke]

I recently switched motherboards and ever since I've had troubles with one of my HDDs. The drive will spontaneously fail to respond. Everything will be working fine then all of a sudden Windows doesn't see it anymore. After a restart, things are usually good again, but not always.

It's becoming more frequent. I don't hear anything that sounds "bad", but I'm also unsure of the likelihood that a SATA controller would be so unreliable. Should I assume it's the drive, or the motherboard? I'd hate to replace the motherboard again.

The drive is a 500GB Seagate 7200.10, only a few months old.

Update: the drive started to no longer show up at all, even after numerous reboots. I opened up my case and managed to switch which SATA cable goes where and rebooted. BIOS could then see my "failing" drive, but not my boot disk. Switched back and once again my data drive is not detected. So I unplugged my CD-rom so I could have a working SATA and now I have access to both of my HDDs. The 'failing' drive, while now detected, seems to be seeking louder than normal, but I don't know if that's because I have the side panel off... or what.