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07 Jan 2012  

Windows 8.1 x64

No, if you have Bitlocker and enter an incorrect password at the TPM prompt, it should then prompt you for your recovery key (48 character key) that was generated when the machine was bitlockered (you were asked where you wanted to save it when you started the bitlocker process - you need that key now, so hopefully you saved it). If you enter that correctly, you can then get into the partition without issue. Once you're in, you can suspend bitlocker from the control panel, reset and re-initialize the TPM, and create a new password (and then re-initialize bitlocker with a new password and recovery key, which you should keep securely somewhere else, not on that machine). The machine will then work, protected, with the new motherboard and password you set.
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