IMAC Mac OS X logging in error

My MacBook Pro (OS X 10.4.8) has suddenly locked me out!
When I try to log in (only one user, with admin privileges, FileVault switched on) it rejects the login saying "You are unable to log in to the user account "Adam" at this time". (Read on: it gets worse...)
I'm certain the password is correct (and correctly typed, no caps lock, keyboard working properly etc.).
When it lets me use the master password to change the user password, and I try to do so, I get the same error message and cannot log in.
Can you please help!

Yikes, Filevault may mean your user data is lost, but you may still be able to boot your Mac, but first...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

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The log contains a vast amount of information, almost all of which is irrelevant to solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

IMAC Mac OS X logging in error

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