Mac shuts down during startup after removal AppleSetupDone in Terminal, can I fix this ? 'touch' didn't help.

Hi, first of all thanks for reading, and I apologize for fooling around in Terminal.
I followed a method to remove applesetupdone in terminal, in order to enter the menu to create a new admin account. I had done this before on a computer that was given to me and it had worked very well. This time it didn't, though. I know I used a different website this time, I'm pretty sure the previous one made use of sudo, this one didn't.
I must have done something wrong. Perhaps when I followed a hint that came up inside terminal that told me to load something, because what I wanted was impossible / read only.
In any case my MacMini (1.83 ghz, Snow Leopard) starts up and shows the grey apple logo and the progress 'wheel', then shuts itself down. It does not mount when I connect it to my macbook with firewire. I can still get into sum / terminal but I don't know what to do. I tried 'touch' to restore applesetupdone but it didn't work.
I would really appreciate any help.
Thanks in advance!

Humm.. you'll need to startup from your System Install Disc to test, repair or restore from Time Machine.
Some options for Starting up from your Install Disc include:
1. in an External Optical DVD Drive.
2. from another iMac in Target Disk Mode.
3. from a copy on a Thumb Drive or External HD.
It's to bad that you are using Time Machine on the second HD instead of a clone with Carbon Copy Cloner - Home or SuperDuper! that you could boot from for testing, repairing and/or restoring.
If none of the above helps?
There is one good thing about a Mac Mini, it is much easier to tote into the local Apple Store or AASP than an iMac. see > Apple - Support - iMac - Service FAQ

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Computer shuts down during startup

Hey everyone,
it shames me a little to ask for help about computers because I am usually ok with doing this stuff myself.
This time, however, I cannot seem to fix the problem indefinitely.I need a laptop for school and cannot afford another so any help would be greatly appreciated!:
I will just point the facts out:
After a few years use (two) it now shuts down during (windows) startup.
I ended up cleaning the Heatsink/fan yet the problem persisted.
The model is a Toshiba Satellite A200-PSAF6A.
I am no longer under warranty.
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It starts up fine with the power plugged in only in safe mode.
Using CCleaner and Defraggler temporarily fixed my problem (for about 5 minutes or so).
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Since this started happening, I have reinstalled vista 32bit to out of the box condition and updated to the latest bios, to no avail.
Computer has always run hot since new, seems to have very poor cooling. But the fan operates, most of the time on full boar.
Do you think this is a software issue or a component issue, or cold joint.
BTW it will not shutdown at all if I keep the computer in the F12 key settings area,im not sure what this place is called, but you choose to boot from cd here.
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Mac shuts down during startup after removal AppleSetupDone in Terminal, can I fix this ? 'touch' didn't help.

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