Some ThinkPad models are unable to boot to an external media after Sophos SafeGuard 6.0 software is installed. The system may hang at a black screen.
The above symptom is associated with, but not limited to, the following systems:
When Sophos SafeGuard 6.0 software is configured on an affected ThinkPad system, it may not be possible to boot to external media from within the Sophos Power-On-Authentication (POA) application. The system may hang indefinitely at a black screen instead of booting to the external media. The system can successfully boot to Windows and can also boot to external media from the F12 boot menu. The issue is limited to booting to external media from within the Sophos POA application.
Lenovo has confirmed that this is an issue with the ThinkPad BIOS on the affected systems.
To resolve this issue, update the ThinkPad BIOS to the following versions listed below. Some of the BIOS versions may not be available until after August 2012.