Why cant I login to my Mac Pro?

Hi,
when I try to login to my Mac Pro from wakeup screensaver (it asks for the password), it no longer accepts my password.
When I erase the username on that screen and try to type it in, it does not echo the characters on the screen either.
It just "writes invisibly" moving along the cursor but the username doesnt show.
When typing the password the little round dots do show but it doesnt accept it.
Any ideas what that could be?
Id like to avoid a hard reset...
thanks
the Wumpus

You can delete the Keychain: http://docs.info.apple.com/article.html?path=Mac/10.5/en/9078.html
If you need to reset your login password (you may need to do this before you can delete your login Keychain): http://support.apple.com/kb/HT1274
Scroll down to "Resetting the original administrator account password".

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To check the model number hold down the option/alt key, go to the Apple menu and select System Information.
iMac (Mid 2007 or newer) model number 7,1 or higher
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MacBook Pro (Mid/Late 2007 or newer) model number 3,1 or higher
MacBook Air (Late 2008 or newer) model number 2,1 or higher
Mac mini (Early 2009 or newer) model number 3,1 or higher
Mac Pro (Early 2008 or newer) model number 3,1 or higher
Xserve (Early 2009) model number 3,1 or higher
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2 GB or more of memory (More is better - 4 GB minimum seems to be the consensus)
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Check to make sure your applications are compatible. PowerPC applications are no longer supported after 10.6.
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Since I'm not interested in the technique details of all the problems, it is also grateful if you would provide a direct instruction to let me setup the computer for the purpose.
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which isn't good. However, that hasn't happened...YET. Let us hope that it doesn't
John B

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Ok I fixed it.
For the purposes of helping someone else in the future, I will document how I did it.
The problem was that the volume that the had the user directory on it had accidentally been renamed. I think the culprit responsible for that was my almost 2 year old son. So when the computer went to boot up, in the user setup it was looking in the wrong place for user information. Thus, the login error.
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The first way...
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