[ubuntu] Blank screen on startup

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http://ubuntuforums.org – I have an encrypted drive and after upgrading to 12.04 I have found that about 30% of the time when I start up, ubuntu properly displays the text prompt for me to enter my password to unencrypt the drive. The rest of the time it lands at the prompt but the screen is blank and my external monitor registers as having no input. I can still type my password though and then the monitors come alive and take me to enter my user password. I'm not sure where to start looking to fix this. Could it be a grub setting? (Hardware)