I opened up the Apple computer and replaced the hard drive with a 1TB drive. In comparison to building a computer from scratch, replacing an iMac hard drive is pretty tricky. The trouble is, a SATA connector that I disconnected pulled the whole port off the motherboard.
Apparently it wasn't soldered on securely. Oh and that SATA port happens to go to the hard drive I replaced, not the DVD drive (which would have been easier to do without).
I didn't pay much attention, I thought it was connected to the LCD I had to pull out. Luckily we were able to find someone who could solder the connector back onto the motherboardd. We then put it back together and it works well. We used Carbon Copy Cloner to transfer everything and the OS to that new drive.