My Ubuntu/Win7 dualboot Asus laptop(K53SJ-SX216V) won't boot Ubuntu (kernel 3.4 from official Ubuntu kernel ppa) anymore. It all started when I suspended my laptop for lunch. And when I came back and started the computer again "networking was disabled" and Ubuntu 1204 refused to connect to my home WiFi network in Unity. So I logged out and tried XFCE: exactly the same.
I had already re-enabled networking. But I still wouldn't connect. So I decided to reboot the computer. But the "log out"-button in XFCE didn't do anything. So I decided to reboot with "sudo reboot".
But the "Ubuntu logo and "moving white and purple spots"" kept showing. So I held the power button to force shutdown the laptop. After that I turned on the laptop again but doesn't come further than a black screen with white letters. After I a little while I the white mouse cursor appears and I hear the sound that you normally hear at the login screen. But the black screen is still there...
I have booted several times.