Hello all! Sorry, my english is not good, but I'll try to describe my trouble:
I was updated 10.9.2 to 10.9.4, after update installation I've done all steps of the manual at the beginning in this topic. Now I have only one trouble: video-files (checked by .avi, .mkv,.mp4 files) not opened (vlc, quickmovie. Videos in youtube (and others flashplayers) shows with freezes (something like low FPS), but sound works correctly. Same trouble in games: sound works properly (headphones port works fine), but video is very very slow... Cursor moves also without any lags, Launchpad manu opens with freezes (slowly)
In Windows this problem would be solved by graphic-card driver reinstalling But how I can fix it on my hackintosh ( Dell Inspiron 7537, HD Graphics 4400 / nVidia GeForce GT 750M) ?