MacBook Pro freezes at startup on grey screen with apple and spinner
I was on Firefox and suddenly the screen froze. 10-15 minutes later i still couldn't do anything on it so i had to force power my laptop off by holding down the power button. Normally when I have this sort of issue, this will solve it. But when I try to turn my laptop back on it gets to the grey screen with the apple logo and little spinner thing and just stays on that screen forever. I'm not really sure what to do now. A couple articles suggested "reseting the PRAM" and I tried that but it didn't help. If you have any suggestions if really appreciate it. And I'm not really sure if i have everything backed up and I really don't want to lose all my pictures so if you could keep that in mind if you have any ideas I'd appreciate it. thanks!
MacBook Pro with Retina display