DROPPED FRAMES ERROR

After converting my footage from H.264 to Apple Pro Res 422 LT, and getting a brand new super-charged iMac, my footage is still experiencing dropped frames every 5-6 seconds. The error message tells me to turn off UNLIMITED RT and even after doing that, I am still getting the same errors. I know it cannot be the computer, especially having got the new iMac with 16GB of RAM and a 2TB hard drive. ** All the footage is on the internal hard drive and not on an external. Does anyone have any ideas? I'm almost ready to ditch FCP and start re-editing in iMovie tonight.
Thank you in advance.
Stan

It was previously on an LACIE Firewire 800 External Drive and I was advised to move the footage to my internal HD for better playback. Perhaps the problem is not the drive, since I now have a 2TB internal ..... maybe the problem is the format it is in. I converted the footage to APPLE PRO RES 422 LT, imported into FCP and when I was editing it on my previous iMac, I did not experience the dropped frames as much. After getting my new iMac, the problem resurfaced .... which made no sense to me since I got a mush faster + beefed up iMac.

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