Can't Change a User's Password - "Reset Password" is Grayed Out

Question

I'm trying to reset a user account in OS X 10.4.11 on a MacBook. I am the administrator and am logged in as such.
I have gone into System Preferences > Accounts and clicked the unlock icon, put in my admin password, and selected the other user from the list on the left (the other user is listed under "Other Accounts").
But the "Reset Password" button is simply greyed out, I can't select it. Any idea what I can do here?

Answer 1

Hi, not sure what is going on yet... can you change other ones?
"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. (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 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.