Mac loses all users and System Administrator

i work in a professional recording studio and we have had this happen twice in the past week or so. the computer works fine and then we shut it down and restart and then the login screen appears. the computers are supposed to be set to automatically log in. then there is no way to log in. we dont have any passwords set for the computers so normally when we install software we type in the username and hit enter but this is not working for the login screen. we tried logging in as SYSTEM ADMINISTRATOR for the username and password and that doesnt work. we start up from the install disc to change the password but there are no users. not even an admin.
they are powermac G5s. all software is up to date. these computers are never online and all software installed is completly legal. no cracks or viruses.
does anyone know what could have caused this? and how to prevent it?
also is there a mac software comparable to "goback" on the PC? It sets apart a % of the HD to track ALL movement on the HD and if something gets f-d up, you hit the spacebar during boot and pick the day or time when you knew the system worked fine and EVERYTHING goes back to the state it was at that moment (all files, options, settings, everything.) I've tried Carbon Copy Clone, but thats not the same, takes over an hour to 3 to do, plus that hasn't worked very well for me in the past; javalthread errors and \ditto: errors.
these computers have worked fine for the past 9 months now. so we dont know whats going on. any help would be greatly appreciated. sorry for the long post i am trying to be as specific as possible.

if it happend on one machine so far and appears to be related to the PT plugin being moved around, that could be it.
plugin could be associated with certain location within the disk or the OS when it installs originally, when moved around it could generate errors (not being a developer it's just a wild guess)
for ex. some applications check for certain peripherals
and hardware etc. in the background, or extensions may conflict with other sfotware.
if possible, you could try and replicate the same actions on "safe" machine - if it does the same thing, it's a plugin messing things up or conflicting with something.
it would be easy to use external drive with the same software, boot from external drive and replicate the steps.
it is also possible that the OS got corrupted somehow on the machine or the hard drive may have problems, and PT plugin has nothing to do with it and was just coincidental.

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And question is STILL not answered. WHICH is to be downloaded and used?
I would like an answer.

Thank you for the clarification! It is really kinda circle-speaking to state on an information page to put forth info people need in that manner. It really does add to the confusion and frustration when you need a simple,
straight answer, such as you gave, and you dont get one. Kind of like that . . other... software company....
This rabbit hole still continues, though. I'm going to ladder it out, just to see for myself:
Have: MacBookPro / 2.4 GHz/ Intel Core i5/ running OS X 10.6.3 -
Need: latest version of Java, so Flash update can be loaded;
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        Found:   Update 2 is proper update for Mac OS X 10.6.3. Could not find download on Apple website;
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Attempted: Tried to find Java for Mac OS X 10.6 Update 8. Half Joy. Confusing, no straight info.
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Attempted:   Tried to find update to OS X 10.6.3 to 10.6.8. on Apple website.
how far does the rabbit hole go?

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Have you tried
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p.

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Hi,
i want to know How to reset All users and delete their tables with username- system and password-manager.
thanks

Hi
Here delete means truncate or drop?????
If drop use the following statement to generate the script:
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Reset Password using Recovery HD
Boot into Recovery Partition.
Start the computer,then press and hold down command and R keys to start into recovery partition.
When you see the Apple logo, release the keys.
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Move the mouse to the menubar at the top and click "Utilities", then select "Terminal"
from the drop down.
Terminal window will appear.
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Enter a hint.
Click the "Save" button.
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Mac loses all users and System Administrator

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