Cannot login as non-root user

[beolach@juno.com]

On my brother's computer, running Slackware 9.0, we have just recently
begun experiencing problems signing in as non-root users, either from
normal login, su, su -, or ssh.  After entering username & password,
login prints the error "Cannot execute /bin/bash: Permission denied"
and returns to login prompt. Su & su - from root prints the same error,
"Cannot execute /bin/bash: Permission denied" and returns to the root
shell.  Ssh gives "/bin/bash: Permission denied" and connection lost.
Root can sign in with no problems at all.

The first thing I did was check the pemissions on /bin/bash, and it
is executable for everyone: -rwxr-xr-x.  We've also un/reinstalled
the bash package (we've tried the bash packages from both the
slackware-9.0 and slackware-current distributions; bash-2.05b-i386-2
and bash-2.05b-i486-3), with no change.  I've also removed & readded
the user accounts in /etc/passwd & /etc/shadow, both with vipw and
userdel/useradd; again with no result.

We started experiencing this quite suddenly, while we were trying to
get X setup with 3d acceleration for my brothers ATI Radeon 9500 Pro
(which is still not working, anyone here have experience?), and I am
have no idea what started the login problems, because obviously X has
nothing to do with login, and we really weren't doing anything else.

Any help resolving this is greatly appreciated,
Conway S. Smith

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