Currently Being ModeratedJun 4, 2013 6:59 PM (in response to Aries47)
Power off the device and disconnect all external device like a printer or external hard drive and just leave your mouse and keyboard connected. You have to press and hold SHIFT until it gets you to Safe Mode screen and go to disk utility and run a quick check. There's also another way to boot, reboot machine and press and hold OPTION S to enter the single user mode. Try them both and let's see what comes next..
BTW, Darwin/BSD means Apple's UNIX code which is Darwin while BSD, Berkeley Software Distribution is the part where you got it from.