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I've attached a HDMI monitor to my Pi running Raspbian. In the past external displays have worked fine.

Recently, when I connect my Pi to a HDMI monitor I get the usual bootup screens and the bootup log scroll. I can even access NOOBS and configure it there. But as soon as the bootup scroll finishes, I'm stuck at a screen with a blinking "_" in the corner. The Pi is otherwise working fine, since I can log in via SSH.

The only hardware change I have made is to add a 4D systems 2.5inch GPIO touchscreen. I can't remember if the HDMI output worked after installing the GPIO display.

  • With a keyboad attached, try cycling through Ctrl-Alt-F[1-6] and see if anything changes. – goldilocks Sep 15 '16 at 13:05
  • Yeah, that got me to the terminal. I'll go back to trying to work out how to get a GUI running on external monitors. The GUI works fine on the GPIO, so I shouldn't have too much trouble. – Professor_Hoover Sep 15 '16 at 13:07
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    Those keys take you to an array of virtual terminals represented by /dev/tty[1-6]. Normally at boot you start on tty1, but if you are running a GUI, that will occupy one of them and if it is not the first one, the system will switch to the one with X running on it. If that's not there, it could be the one with the blinking cursor (something is hanging on a mishap), in which case you may or may not be able to start a second instance. – goldilocks Sep 15 '16 at 13:11

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