Please see my post here for a start. After the Failed Installation of a Video Card/Driver Ubuntu 13.04 Displayed a Blank (Black) Screen. There are a variety or reasons for a blank screen, each of which has a different solution.
I see that you have Jockey. For me, Jockey was critical in resolving my blank screen as I was able to use it to assign the Nvidia driver. Under Ubuntu's system settings, for my computer, no proprietary drivers are displayed even-though they are shown as available under Jockey. Furthermore, in my case, the initial re-boot after using Jockey to set the Nvidia driver failed. Taking a leap of faith, I simply re-booted and the screen display worked as expected.
As an additional thought, I suspect (but I have no proof) that the blank screen may result from an Nvidia program associated with (hypothetical) driver XXXX, but is incompatible with driver ZZZZ and was not removed with the purge option for driver XXXX. All that I can say is that aggressively removing all Nvidia programs before using Jockey seemed to help in getting the blank screen problem fixed.
Good Luck. It took me quite a while to get this issue resolved.