hello. Today I installed mountain lion 12495 10.8. After the successful installation, I can not display the WELCOME, since it appears gray screen with mouse free but does not appear welcome. The PC has the following features: Asus P5Q-vm intel dual core E6300 2.8 GHz 3 Gb Ram Ati Radeon HD 4670 I disabled the flag graphicsenabler. All'avio I started with -v -x, graphicsenabler = no but the problem is not resolved, even changing the DVI connector. I include photos screen.