URGENT Help: Mac mini starts up, then just "died down" (power down...)

Hello all. This is my sis's Mac mini Intel.
Was actually booting from Leopard OS X thinking of an upgrade OS, ran Disk Utility and it reported some error cannot be repaired:
Invalid sibling link
Volume check failed
Error: Filesystem verify or repair failed
So I gave up the idea, quit the installer and restart, and press "Eject" to get the disc out.
*But now, it seems like when the Mac mini starts up, with the grey Apple logo and the spinning wheel, after a while, it just "stops", "fades away" and power off. Like a "sudden shut down" or "sudden sleep"*
So far I have *tried reset PRam* and also and SMU or something (plugging every cord out etc) but to no avail.
*HELP!! At least I want to be able to do a boot up to retrieve all the data before any hard re-format or something*
Thanks and cheers

It is possible, with the errors Disk Utility reported, that some (possibly even all) of the files on the drive will be damaged or inaccessible, so it is best to proceed with some caution.
There are several possibilities for recovering the files, all dependent on the situation. You could, for example, remove the hard drive from the mini, fit it in an external drive case and connect it to another system. That would, in my view, be the best option. Alternatively, you might be able to get the mini into firewire target disk mode (hold the T key down during bootup) and connected (via firewire) to another Mac, rescue files that way, or boot the system from an external drive which has a valid MacOS install for that system, and then rescue files from the internal drive.
You may find, if the drive's data structure is corrupt, that even if you can access the hard drive via any of the methods above, you'll need a utility such as Data Rescue II (http://www.prosofteng.com/products/data_rescue.php) to locate and retrieve what you need. You might also consider use of a utility such as DiskWarrior (http://www.alsoft.com/DiskWarrior/index.html) as a means to attempt a repair of the disk so that it can be returned to use - though this is by no means certain to succeed, and may not resolve potential data loss.

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Message was edited by: aroussell

Welcome to Apple Discussions!
The alternating finder and question mark during attempted startup is an indicator that the system can't find the MacOS install on the hard drive, or that the hard drive is failing. The fact that when you started up with the Option key down you did not see the internal drive as a startup option also points to that issue.
1. Could this be due to a keyboard issue? The one I was using was a wireless Microsoft one (only thing I could find locally) and after reverting to the old keyboard off of my old iMac, the problem seemed to be solved, but has since returned (the keyboard off of the old iMac isn't reliable either).
No, this isn't a keyboard issue. Keyboards that are faulty or not entirely compatible will simply prevent you from changing the way the system boots, or from properly using the system once it's running. Swapping to the old keyboard is likely only associated with this problem because you also reset the parameter RAM at the same time.
2. Is there anyway to fix this without losing everything on my hard drive?
The problem is that if the hard drive is failing, your data may well be already corrupt, but a good first place to start is to find your original install disk - the one that came with the system - and insert that. Then reboot the system, and hold the C key down to try and get it to boot to the install disk. If that doesn't work, try holding the Option key down again to get to that same boot loader screen you had before, (with the install disk still inserted). That should give you the option to select the install disk and get the system started up from that.
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If you can boot to the install disk, open Disk Utility from the Utilities menu and see if the internal drive is shown. If it is, select it and then click 'Repair Disk'. That will try and identify any errors and if any are found, will attempt to repair them. If you get errors that it can't fix (typically it will report 'error on exit') then the drive has probably become corrupted and you'll either need a good utility such as Alsoft's Disk Warrior to try and fix it, or perform an Erase and Install to reformat the drive and install MacOS from scratch. This latter option will wipe your data of course, so should not be done unless you don't mind loosing your data, or have tried everything else and have no alternative!

URGENT Help: Mac mini starts up, then just "died down" (power down...)

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