Would love to help, how about some information first...
What distro, what bootloader, etc?
If I understand you correctly, even under single user mode you cannot login? If so, you should be able to take a linux bootable CD (possibly the installation cd) and mount your hard drives to access the data. If not, grab a live cd and we should be able to save data and then reinstall if need be.
Reply back with more info, and we'll try to help.-
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