Lost all data on my G5

The strangest thing happen on my powermac about 12 midnight.
I had just finish watching a movie and was just browsering the net when I notice that my folders, files were disappering from the finder. I tried to open up "activity monitor" but I couldn't get the mouse nor the keyboard to work. By then I decided to do a "cold" shutdown, since I wasn't able to see or stop what was happening. when I restarted, there was no OS to boot into anymore(OS X was no longer found by the boot loader). I then booted via the Apple boot disk to see if I could get access to the drives. To my dismay there was NORTHING on my boot drive and all my data on my external firewire drive was gone. God I almost died. I was beyound myself. what had happen that the system had began to erase all the data? I totally lost everything I had. the drives were totally wipe clean. In all my years with the computer this has never happened before. what could have caused this? could it have been a virus? or did I get hacked? right now I really cannot explain what and why this happened. I had firewalls running (2 seperate ones)sophos antivirus, had "little snitch" running so I control what goes out to the net, etc.
I don't know if I will ever find an explanation for this, but am *ucking **** that all my data on my back-up drive and the system volume is gone.
HELP HELP HELP! what the **** happen?!
Powermac 2.5 G5 Mac OS X (10.4.5)

Here's how I would troubleshoot this if it were my Mac:
First, check and recheck all your cables and connections. Reseat them and make sure everyting looks in good shape - probably not the source of your prooblem but you have to check everything before doing what I'm about to suggest.
There's a good chance the drive might be on it's last legs but maybe it can be saved. If at all possible try to do back-up of your drive - copy whatever you can to a CD (or DVD if possible). Sounds like it's all invisible now though. It is probably still there but the directory may have crapped out for any number of reasons.
Next, boot your Mac using the system disk (the one that has your OS on it). To do this put the disk in the drive and restart it holding down the "C" key. This makes the Mac use the disk as the source of the OS instead of the drive where it is installed. You may actually be able to see the files that disappeared - if you have a second disk drive you could do a back-up at this point but it'll be really slow - better than losing important stuff though. At this point you can use Disk Utilities/Disk First Aid to run Apples' diagnostics to see what's causing the problems. Hopefully it's just a corrupt directory which can be fixed real easily.
You can also do this using Tech Tool or Disk Warrior as your boot disk if you have one of them. I've heard many good things about Disk Warrior but have never used it. I do have and do like Tech Tool quite a bit (I am no longer a fan of Norton's Disk Doctor when dealing with OS X and Dual/Quad G5's).
After running the diagnostics there will be a report of issues and if the software of your choosing can fix it, fix 'em all. I would actually try more than just one of the above apps. I would run Apple's Disk First Aid and fix all items possible then do the same with Tech Tool, etc..
If it is simply directory corruption, bad sectors or something relatively simple like that and this fixes it then you're good to go.
If there's still problems then the last chance to save the drive is to use Disk Utilities, Tech Tool, or Disk Warrior, etc. and do a complete info wipe and reinitiallize the disk. Don't just delete the system folder and reload it - reinitiallize it and use an option that overwrites every bit on the drive, too, which eliminates any coruption from carrying forward. Unfortunately this means reinstalling the OS from the ground up as well as the loss of any data that you weren't able to back-up. This is the only way to be sure that any lingering problems were software related. Do this last step only as a last resort - but if the drive is still good but the corruption is too severe for diagnostic apps. it's the only way to get it back up and running. If after doing this you still have problems then you know it's the drive itself and replacement is in order.
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