Password resetting by itself...

My Dad recently bought a 17 inch iMac (intel) and account passwords randomly frequently (4 times in the last 2 months) reset. He is unable to log in to his account, or do anything that requires administrative access.
After it first happened (I reset the password with the Tiger disc) then I enabled remote login and set up ssh authentication keys to log in automatically (with no password). This allowed me to reset his password when it mysteriously resets by itself.
What is causing these random password resets? How can I fix his system so passwords cannot be mysteriously reset? Has anyone ever heard of this happening. Any insight into this problem would be much appreciated.
Thanks.
Mike.
iMac 17" (intel)   Mac OS X (10.4.7)  

Ed,
This information is stored in the Netinfo Database. There are many instances when I have recommended someone delete and restore their Netinfo Database, but usually because the cannot lo in, and they cannot reset their password successfully. With the NIDB, it's usually all or nothing; it is either working, or it's not.
If yours is a problem with the NIDB, it will be the first that I have seen that is "intermittent" like this. Something like this would lead me to believe that some data (in this case a password) is being written to a specific location on the HD that is losing data. There is a name for this: Disk Error.
So, I'm going to first recommend tat you boot to your OS X install disk, choose a language, then open Disk Utility from the "Utilities" menu. Select the startup disk, and click on "Repair Disk" in the First Aid pane.
Let's see what, if anything, this reports. If Disk Utility gives your HD a clean bill of health, yet the problem persists, I can have you replace your NIDB. This process is pretty easy, as long as you can follow clear instructions, but I see no benefit to doing it unless and until we are certain your HD is OK.
Scott

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