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I cannot now see the session login screen - just a blank black screen. No icons, no username box etc. is displaying.

This is on a Compaq Presario c700 laptop running Ubuntu 13.04. Yesterday the machine was running fine and it was shut down normally. No changes have recently been made.

Today I switched on and the OS seemed to be booting up OK, accepted my password for the encrypted volume and the progress screen progressed to the point where I expected the desktop session login screen to show - but nothing!

Gnome, Unity and LXDE desktops are installed with LXDE being the current session.

Any suggestions appreciated.

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