cannot start x server

My linux (fedora core 6) previously worked fine. One day after it
booted it went back to the command line login prompt and said 'Failed
to start the X server. The diagnostic output said 'xf86MapVidMem: Fail
to open /dev/mem (no such file or directory). I can't even log in with
correct user/password because it again goes back to login prompt. I
used the rescue disk to boot the system and could eventually log in
and found the /dev/mem does exist.

Anyone can help on this?

Many thanks
Timmy

.

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