So I went to debugging:
1. Change SATA cable - No result
2. Changed position on motherboard - No result
3. Changed power connector - No result
4. Moved around all SATA connectors on motherboard (CD-Rom, front panel e-sata and 2 x SATA disk) - No result
I think I have exhausted all my possibilities, and it seems the disk is dead. Anyone have a good idea to how I can further debug it?
What happened is that my boss' laptop died, so I offered to save his personal data from it. To do that, I had to move some connectors out, and I can't really remember how I moved them, but I don't think I changed the setup I had, I just unplugged one of them, and then replaced it afterwards.
My last attempt is going to be to move replace the position to the one my primary disk currently is in. If that fails, I am going to buy 2 x SATA 600 1 TB disks and replace both of my disks.