Why i can't run fcpx on iMac 3.06 Ghz core 2 duo with 16Gb ram?

I Can't run FCPX on my iMac.
It's working in theory, but it's stopping playback even without any effect, (video frames were dropped during playback - message), i can't preview any effect, as loading preview taking for ever.
I recently upgrade RAM from 4Gb to 16Gb 1067 Mhz DDr3, and I thought that's make a difference but not.
I have latest Lion 10.8.1 update. FCPX ver 10.0.5.
I try to work on 1080 video files located on main HDD , not external. they are from digital camera, 1920 x 1080, 1080p and codecs H264 linear PCM, 29.97 fps stereo.
Any suggestion?

You have loads of power so something is not OK.
Is your internal HD more than 80% full?
For a start trash your preferences using http://www.digitalrebellion.com/prefman/
Incidentally if you are using 50p/60p footage, that could be the problem especially on an internal HD.
You should always transcode 50p/60p AVCHD to ProRes 422.
Do that and I am sure you will see an improvement.
Message was edited by: Ian R. Brown

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Brett - A sticky mouse and keyboard as well as an optical drive that doesn't eject all adds up to more than an open box unit to me. I strongly suspect that you got a demo unit. Doesn't really matter, you did get a pretty good price, especially with a 3 year warranty.
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I just migrated the contents of my 17” G4 iMac to a 20” Core Duo. The only piece of software that wouldn’t run on the new Mac was Nikon Capture 4.4.1; upon launching, it told me that it was missing necessary files. I reloaded the software from my original 4.0 discs. This time the error message said to click to go to PACE and run the installer, which I did. The installer claimed to run successfully, but NC4 still claimed to be missing files. At this point I went to the NikonUSA website and downloaded the NC4.2 updater. After running this and rebooting, NC4 ran just fine. I finally updated it back to V4.4.1, which also works properly.
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Danny W.
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Why i can't run fcpx on iMac 3.06 Ghz core 2 duo with 16Gb ram?

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