Unable to restart Finalcut7

Hello to you
I work on mac with Finalcut 7 comfortably for a year, but since yesterday, I can no longer open the application. The boot process starts and then quit working.
I see no reason for this bug. I check the status of my hard work, it is ok. I removed the software via "digital rebellion" and then reinstalled final cut: the problem is still there.
Is anyone else have this problem or have an idea about the possible reasons for this bug?
Urgent payday. Thank you for coming to my aid

Problem solved !
Finally, after my extensive research on the web, I proceeded to the removal of permissions Fcp files in the library folder of my system. And it worked.
It is better to start the new year.
Happy new year from Paris to all the Mac community
Vidéo2014

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    I have the further complication of finding that the Apple store will not replace the hard disc for my computer because it is over 5 years old. I can probably locate a shop such as Best Buy locally who can do that, or I can simply purchase an external hard disc and use that as my primary hard disc until I either replace the internal hard disc or simply replace the computer. Since it is a 7 year old iMac, it would not be surprising to have to replace the hard disc after this length of time. I also see that there are instructions available online to explain how to replace the internal hard disc myself, but I'm unsure at this point whether or not I want to do it myself.

    Lacking any responses to my initial post above, I will briefly update how I resolved this issue today.
    Installed new external hard disc, 1 TB WD My Passport for Mac, and straightforward setup involving first installing current OS X operating system, then system migrator utility to rebuild the same setup as saved in latest Time Machine backup. The whole process was somewhat time consuming due to my internet connection speed and USB data transfer speeds but it went without any issues. The computer now boots up and operates identical in all respects to how it did before the problem occurred.
    Regarding the internal HD of my iMac, if I now run Disc Utility to verify the disc, it reports "appears to be OK". However, viewing the disc usage in "About This Mac" window, it displays as entirely empty. Opening it in the finder also shows only a "Apple Hot News.mbox" file and a single .jpeg image, and .nothing else.
    Interestingly, the Bootcamp partition of my iMac's internal HD continues to work fine and appears unaffected by the problem. I use bootcamp rarely but still will plan to set up a replacement bootcamp volume on the new hard disc soon, in order to take its place.
    That the problem surfaced coincident with the software update may have been nothing more than bad luck? At this point I have no reason to suspect that the softward update had anything to do with the difficulties.

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