osx 10.8 blank screen when logging in
Hi All,
I'm a new mac user.
I have a mbpr (8/512) and when I boot up and log in, it always has a blank screen.
I press Apple + Q and a few other keys, they all seem to work because it makes a sound but the screen is always blank.
I then have to hold down power to shut it off. I turn it on again, on 2nd boot up and login, it says something like "some programs may have caused problems with your login in last time so press ok to proceed to login with these programs open or cancel to start fresh".
The thing is, i'm lucky if I get prompted with this because sometimes I have to repeatedly reboot the mac 3-4 times before it 'recognises' there was a problem and it asks me that question before logging in.
How do I troubleshoot this problem?
Thanks.
MacBook Pro with Retina display, OS X Mountain Lion