Mac mini server hang at startup

My mac mini server (1st gen) installed with Lion server has a strange problem.
At some point, it stop to deliver it services (imap, dhcp and ical server). I connect on it (wich take a long long time), make it restart by the system menu entry.
It restart, and stay forever with the blank screen with Apple logo and the waiting circle which loop.
No way to restart.
I then boot on a Mountain Lion installation USB key (I loose my Lion one :-(  ), choose the restore from time machine option, selecting the last entry on my Time capsule, everything goes well, and the server restart with no problem. I can even restart it by the system menu.
But after 2 or 3 month, it has the same problem, and again no way to restart without restoring the last time machine backup.
It's now the third time it does this, and it's make me go crazy.
I've try to start in verbose mode, and I have the following fsck error message :
disk0s2 : I/O error.
Invalid node structure
(4,26622)
the volume on macintosh hd could not ve verified completely
fsck failed !
I've try to start on single mode and do the fsck -fy -> same result.
Does someone has an idea of why it does this ?
Regards,
Marc

Just recently I ran into a problem when I tried to Verify my hard disk and when it tried to verify the catalog, it responded "Invalid sibling link." Repair Disk didn't work. I searched the web and Apple's site, and couldn't find anything useful except to buy DiskWarrior or reformat the drive. Knowing that OS X is built on Unix gave me a few clues on how to proceed. The solution is pretty simple:
    1.    Boot off the OS X CD (reboot, hold C while booting).
    2.    The installer will load up, go to Utilities in the menu and run Terminal.
    3.    Type df and look for the drive that has your Mac system mounted---you'll have to unmount this. On my MacBook Pro, it was /dev/disk0s2.
    4.    Type umount /dev/disk0s2, replacing disk0s2 with whatever disk your OS lives on.
    5.    Type fsck_hfs -r /dev/disk0s2. If you umounted the wrong thing, it will complain that you can't repair a mounted drive. Go back and umount the right thing and repeat this step.
Just for fun, you might want to run another fsck_hfs on your disk (use the -f option because your drive is probably journaled). Hope this helps someone so they don't buy a program that's going to do pretty much what we did with fsck_hfs, and so they don't waste time searching for an answer to no avail. By the way, TechTool Deluxe (3.1.1) didn't find the Catalog problem for some reason (you'll have this on a CD if you have AppleCare), which is why I resorted to fsck.
http://hints.macworld.com/article.php?story=20070204093925888

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    Glad that you got it solved, John. That model was only replaced at the end of last year, it is not that old and far better in terms of flexibility than the current models. Although the current models are growing away from SATA and towards PCI which, in its logical conclusion, will be faster ito access (read and write), speeds.
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