[XFree86] X problem

[Mr Happy]

I've got a Slackware 8.1 with kernel version 2.4.18; the problem is that when I key in "startx" I see "XIO:  fatal IO error 104 on X server :0.0 after 0 requests with 0 events remaining" .   How can I do? Thanks!                                                                                                        Francesco  from  Italy