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I inserted a new video card (Asus GT630-SL-2GD3-L). It was not initially detected by Ubuntu 13.04. I went ahead to the Ubuntu software center and downloaded the nvidia-current driver. Upon reboot, after the Ubuntu splash screen, all I got was a blank (black) screen. However, in experimenting, I noticed that the computer was operating normally except for the display. The video card, for some unknown reason, was eventfully recognized by Ubuntu and also correctly displayed the monitor information.

As an attempt to fix the blank screen, I reloaded the ubuntu-desktop, unity, and xrog. But none of these actions restored the display of the Launchpad and icons.

I found, on August 29, 2013, the solution at these websites. How To Reset Compiz And Unity In Ubuntu 12.10 Or 13.04. Also see: Reset Unity and Gnome to default values [duplicate]. Specifically the post by ZTA, which is the third post down. The launcher/icons were restored. Problem solved.

Since originally making this post, another link was made available that shows both the problem with a solution. "Unity doesn't load, no Launcher, no Dash appears". This post is worth reviewing too.

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Do you get login screen when your system starts? Reply asap so that I can proceed further. –  Saurav Kumar Aug 28 '13 at 15:34
    
The computer is set to boot directly into the desktop, so no login screen is displayed. The computer still successfully boots into the desktop, even though the screen is blank. The programs appear to be fully accessible through the terminal command line and display graphically. –  Steve R. Aug 29 '13 at 12:36
    
Thanks for your reply. You can try a different display manager other than lightdm as it seems that there is some problem in lightdm. I have recovered from this issue using gdm. Give a try to this link: askubuntu.com/questions/337116/…. Reply for further assistance. –  Saurav Kumar Aug 29 '13 at 12:40
    
Close. The login screen appeared under gdm, but once past the login screen, the screen went blank again. –  Steve R. Aug 29 '13 at 21:59
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That is one "duplicate" that I would accept, since it leads to the correct solution. I would also suggest that the other post "My computer boots to a black screen, what options do I have to fix it?" be updated to include fixing the compiz and dconf files. That would make that post much better since it would have another "fix" option to fix a blank (black) screen. –  Steve R. Sep 20 '13 at 12:54

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