Black screen just after boot
Hi
My MBP Retina, mid-2012, has a problem since one month or so: when booting, just after the grey screen with the Apple logo, the screen turns black forever, so I can't use it. Now, when I started it with cmd-r, I could run Disk Utility, scan and repair the disk, with no problems. Whan I try again to do a normal boot, I get the black screen again.
I went to one assistence office and they reformatted and reinstalled MAvericks, but the problem returned.
The MBP now has Mavericks (10.9.2).
Help is welcome.
MacBook Pro with Retina display, OS X Mountain Lion (10.8.2), 2.6 GHz 8 GB