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Windows 8.1 Bitlocker - automatic shutdown during password prompt

Hi,

I´ve activated Bitlocker on my hard disk.
As I have no TPM socket on my motherboard, I activated a group policy as described here:
http://www.howtogeek.com/howto/6229/how-to-use-bitlocker-on-drives-without-tpm/
"Require additional authentication at startup"> "Allow Bitlocker without a compatible TPM"

Encryption was completed and everything worked fine after that.

But when I next time started my pc it suddenly shuts down while I typed my password.
The shutdown is at about 1 minute after the Bitlocker screen appears but sometimes it is even earlier. Even if I start typing my password, the pc shuts down.

Are there any bios settings that could interrupt Bitlocker? Are there recommendations for the bios setup when using Bitlocker (boot priority, power settings,..)? Or what else can it be?

Regards


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