i was facing the problem of black screen after apple logo load
But i reinstalled the Nirosh, with the Backup graphics kext enabled, and now the screen is o.K, really thanks
Now, the problem is diferent: after setup the user account, and what else, and come to Desktop screen, the Mouse of my laptop trackpad isn't working.
the keys of th keyboard seems to work normally, but i can't even move the arrow of the mouse.
Is there a suggestion to fix it??
(As i'm not at my house, i didn't test a 3rd party USB mouse)