In FIPS mode, certain self-tests are performed in Windows and pre-boot environments.
These self-tests might impact the performance of the pre-boot.
If the self-tests of FIPS fail, the system's failed components stop completely in one of these ways.
If the Windows Drive Encryption FIPS component fails self-test, the system doesn't activate or enforce policies.
If the Windows Drive Encryption driver fails self-test, the driver performs a bug-check (BSOD).
If the Pre-Boot Drive Encryption FIPS component fails self-test, pre-boot stops functioning.
Move your mouse in Pre-Boot
Additionally, FIPS 140-2 defines minimum requirements for entropy during key generation. This might lead to key generation errors in pre-boot where insufficient entropy (randomness) is available at the point of key generation. To avoid this, you can supply entropy (randomness) into pre-boot by moving the mouse randomly before you perform the action that produced the error.