I have a problem with my moms MacBook pro (2010, 2.4 i5 with 320 GB 5400 rpm HDD and 8 GB RAM). I was browsing the web with safari and a few tabs when the computer froze, with the spinning beachball. I forced quit safari, and it seemed to be fine. So I shut the lid so it could go to sleep. But it wouldn't. I noticed it was still running a few minutes later. When I opened the screen, there was a black screen with the mouse being the spinning beachball. I couldn't do anything, the keyboard wasn't doing anything, so I power killed the computer. (held down power button until it shut off). Now I can't get it to turn on. It chims and gets to the apple logo with the spinning icon, but won't get past this. Does anyone know what I should do?