System becomes unresponsive before preboot authentication on a Toshiba Z50
Last Modified: 2024-01-06 09:45:22 Etc/GMT
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System becomes unresponsive before preboot authentication on a Toshiba Z50
Technical Articles ID:
KB87846
Last Modified: 2024-01-06 09:45:22 Etc/GMT Environment
Drive Encryption (DE) 7.1.x Toshiba Tecra Z50 For details of DE 7.1.x supported environments, see KB79422 - Supported platforms for Drive Encryption 7.x. Problem
Users are unable to authenticate at preboot after successfully installing DE, encrypting the hard disk, and restarting. During startup, a blank black screen is displayed instead of the expected DE preboot authentication prompt. This occurs on Toshiba Z50 models in UEFI mode when the Compatibility Support Module (CSM) option is also enabled. (CSM support is required when installing Windows 7 on the system when the BIOS is in UEFI mode.) Solution
This issue is resolved with a BIOS upgrade provided by Toshiba. Contact Toshiba Technical Support or visit the Support website and download the latest BIOS firmware update available for this model.
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