Black Screen with cursor at boot up after drive encryption

Products

• Endpoint Encryption

Issue/Introduction

After drive encryption computer boot shows only black screen with cursor, no login.  Symantec Endpoint Encryption 11.1.2 HF2 was installed, and encryption reported successful completion.  This happened on a Lenovo T470 only.

Cause

A single setting for Windows wifi connection caused the issue: Under wifi network configuration in Computer Configuration > Policies > Windows Settings > Security Settings > Wireless Networks under Advanced settings on the Security tab there is a section for Single Sign On. If  the single sign on to "Perform immediately before User Logon" is enable, the machine will present a black screen with a mouse cursor instead of a logon prompt. Pressing CTRL-ALT-DEL at that point just flashes the blue background and then goes back to black, can't login.

Environment

SEE 11.1.2 HF2
Windows 7
Lenovo T470 only

Resolution

Switching this setting to "Perform immediately after User Logon" brings up the login screen normally and login proceeds.