Hey Atara, I'm in a similar situation. I replaced the hard disk on the same model iMac, but now when I boot up, the system doesn't detect the new SSHD. I just get the flashing "folder of death."
Putting the original drive back in yields the same result, so I think there is a problem where the drive's power cable connects to the PS. That's beyond my level, so it's at the tech shop now.
Both drives boot fine from a USB enclosure. It's not the drive.
As for your issue, not sure what's up there. The superdrive on our model crapped out a long time ago and it just takes up space now.
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