Do you have Altiris software that you run in your environment? There has been known compatability issues with this ALtiris software and a recovery partition that the software creates. You can see this KB article online to read more about this issue here:
http://www.symantec.com/docs/TECH149142
I would also recommend that you try upgrading to our PGP Desktop version 10.2. There was a fix for "Blinking cursor of death with Bootguard printed on the screen". This may fix the problem that you are having. You should be able to download it from the licensing portal.
http://lems.pgp.com will re-direct you to there. You can register your old LEMS email address for the download or if you already have a Symantec licensing portal account, you can login with that and access the downloads from there.
Let me know if you still have problems with this after the update to PGP Desktop 10.2