Unable to play any video after update

I use an imac 24 "mid-2007. I upgraded 10.11.4 el Capitan and now I'm not able to see all the videos. IMovie comes with a white screen when I try to life capture files. VLC will not play videos; Also I am not able to preview the videos in the finder. Help!

Please read this message before doing anything.

This procedure is a test, not a solution. Don't be disappointed when you find that nothing has changed after you complete it.

Step 1

The goal of this step is to determine if the problem is localized to your user account.

Select the feedback connections* and log in as a guest. Do not use the Safari connection only 'user comments' created by 'find my Mac '.

While signed in as a guest, you will have access to your documents or settings. Applications will behave as if you use them for the first time. Do not be alarmed by this behavior; It's normal. If you need any password or other personal information in order to complete the test, save, print, or write them before you start.

Test while signed in as a guest. Same problem?

After testing, log on to the guest account and in your own account, disable it if you wish. The files that you created in the guest account will be automatically deleted when you log out of it.

* Note: If you have enabled 'find my Mac' or FileVault, then you cannot activate the guest account. The login 'User comments' created by 'Find my Mac' is not the same. Create a new account to test and delete it, including his home folder, after testing.

Step 2

The goal of this step is to determine if the problem is caused by changes in the system of third party that load automatically at startup or logon, by a device, by a police conflict or corruption of system files or some system caches.

Please take this step regardless of the results of step 1.

Disconnect all devices wired except those required to test and remove all the expansion cards from secondary market, as appropriate. Start in safe mode and log on to the account of the problem.

Note: If FileVault is enabled in OS X 10.9 or an earlier version, or if a firmware password is defined, or if the boot volume is a software RAID, you can not do this. Ask for additional instructions.

Safe mode is much slower to boot and run as normal, with limited graphics performance, and some things work at all, including an audio output and a Wi - Fi connection on some models. The next normal boot can also be a bit slow.

The login screen is displayed even if you normally connect automatically. You need your password to log on. If you have forgotten the password, you will have to reset it before you begin.

Test in safe mode. Same problem?

After testing, restart as usual (not in safe mode) and make sure you always have the problem. View the results of steps 1 and 2.

Tags: Mac OS & System Software

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