This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.
If the "SCO Logon" graphical screen appears, but things get screwy after you login, try this: after entering your password, press F1 instead of ENTER. This "failsafe" login will startup one Xterm and no other clients. You can start other clients from there (for instance, type "netscape & ") and examine the /usr/lib/X11/scologin/Xerrors log file to perhaps figure out what is going wrong. To exit, just CTRL-D or "exit" the Xterm.
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