best try n go "under the hood"...
start Linux , at the bootprompt add (w/o quotes) the word "single" or "rescue", or if that wont work add "init=/bin/sh"
all 3 options would land u in initlevel 1 (single user maintenance) where the login is bypassed, ure automatically logged in as root.
now verify the (shadow)password files and directory access are correct for each user.
u can use linuxconf for this.
HTH, somehow
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