I was thinking something in the lines of Knoppix
But it may not get to computer to boot
Did you try to slave the harddrive?
What model of harddrive is it?
Could possibly try the manuf. hard drive diagnostic utility
I have used the old freezer trick in the past and got a harddrive to run long enough to pull out information
I took the harddrive out of the computer
Put it in a ziplock bag and stuck it in the freezer for a few hours
Put it back in the machine and it actually worked
The HD was making clicking sounds, so had to work fast