HP Pavilion DV6700 Stuck!

Hi. My Pavilion DV6700 froze and I had to turn if off manually and then turn it on again. That's usually not a problem. This time, however, it asked to to repair the startup, which I did, and then it asked me to restart. When I try to restart it, I get the screen that allows me to chose "Safe Mode" or "Start Windows Normally". Neither works. When I do Safe Mode, it goes through a list of things and then all I see is a black screen with an arrow cursor. When I choose to start it normally, I get that same screen immediately and -either way - I can't exit from it without just turning it off. Help! Thanks!