How many disks do you have in this machine?
If more than one is this the primary or back up drive?
Do you have a RAID configuration?
May want to hook it up to a different computer and see if it can be read.
4, including a backup external.
How can I check which is primary? Is that just the boot drive? If it is, then I just have one. And I only have one backup drive.
Do not use RAID.
I hooked it up to another comp and it wasn't recognized at all, it may be because of a faulty mobo on that computer though.