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I used rpi-update to update Raspbian, then restarted it. It got through the boot screen, but then just showed a black screen with a flashing cursor. For some reason, the monitor's backlight was pulsing every second or so as well. The LEDs were all on on the board except for the OK LED.

I reinstalled raspbian with Win32DiskImager, but the same thing is still happening.

The last messages shown before the screen goes blank are:
Starting dphys-swapfile swapfile setup ...
want /var/swap=100MByte, checking existing: keeping it
done.
[ ok ] Starting Light Display Manager: lightdm

What's wrong with it?

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    Could you clarify exactly how far it got? Kernel loading? Start of init? Services launched by init? – Gagravarr Aug 21 '13 at 19:00
  • I've updated the question with the stage it's at before going blank. I'm not too familiar with Linux or the RPI, so please let me know if it's not enough information. – Tharwen Aug 21 '13 at 20:25
  • It could be switching to a resolution that your monitor does not support. – Craig Aug 21 '13 at 20:51
  • Make sure it's not a powersupply problem. Try turning up the config_hdmi_boost in /boot/config.txt – John La Rooy Aug 22 '13 at 2:19
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    Your monitor does not support that resolution. Maybe rpi-update changed some config files that related to X session. What happen when you press CTRL-ALT-Fx (x = 1...6) ? Do you get TTY login? – gurcanozturk Aug 22 '13 at 6:18
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Some googling revealed that the problem was that the partition was full, so increasing it with gparted seems to have fixed it.

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