I have win 7 Ultimate with Bitlocker running on a SATA RAID array. It has worked great up until today. I am presented with password dialog box and I type in the password. Nothing happens and the drive remains locked. Any help is greatly appreciated The password has not been changed and I am the only user with access.

I suggest you refer the following article to restore. Scenario 16: Using the BitLocker Repair Tool to Recover a DrivePlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.