Switching hard drives

Hi, first post here.

I bought a new hard drive after my WD started giving massive errors indicating that it was failing. I bought a new drive and quickly imaged my WD onto my new Seagate. I transferred the image and rebooted, everything was fine, both drives showed up.

But then I don't know what I did, but I did something, because when I shut down my machine and removed my old WD (to send it in via RMA), my system wouldn't boot.

I don't know if I should make a different partition active? or is it physical, like I have to physically switch a cable or a jumper or something?

I provided a screen shot of my disks so maybe someone could help. It's been over a month and it's drivin me nutso.:confused:

Attached Thumbnails