I too had this blank screen issue for my encrypted LVM setup. I found out that grub was installed on my usb installation drive instead of my hard disk. After re-installing grub onto my disk, I no longer get the blank screen. See my adventures [URL="http://blog.nguyenvq.com/2011/09/15/backup-re-install-ubuntu-with-full-disk-encryption-and-restore-all-files-and-settings/"]here[/URL].
I too had this blank screen issue for my encrypted LVM setup. I found out that grub was installed on my usb installation drive instead of my hard disk. After re-installing grub onto my disk, I no longer get the blank screen. See my adventures [URL="http:// blog.nguyenvq. com/2011/ 09/15/backup- re-install- ubuntu- with-full- disk-encryption -and-restore- all-files- and-settings/"]here[/URL].