[ubuntu] B oot results in stalled/failed graphics capabilabies at start up (EXACTLY HALF)

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http://ubuntuforums.org – I'm loving my ubuntu installation and the terminal commands - i've been on windows for so long that it gets boring not being able to upgrade it to my needs. But Since upgrading to linux I'm having problems starting my PC. Mainly, there is an instance where each and exactly every time I start the computer I run into a black screen; this happens after it reaches the ubuntu unity "purple" type screen. After going black, it does not move forward and bring me to the gnome shell I've implemented. Upon a restart (EACH AND EVERY OTHER TIME) it will bring up ubuntu as being ready to start f (Hardware)