Display with RHEL 4, Update 2 going to sleep

[Margaret Doll]

I have a Dell Optiplex GX620 with a DELL 1707FP monitor.  The system   
is connected through the dvi connector.  Graphics for installation  
using "linux textnofb" works.  The registration graphics to RedHat  
through up2date works fine.  The analog connection  to a  Mac has no  
problems.

xorg.conf recognizes the monitor as a DELL 1707FP with an "ATI  
Radeon  X600" board.

When I run "startx", text comes across the screen rapidly, but then  
the screen goes black.

When I press on the monitor status button,  the screen says it is in  
the energy power saving  mode and to press a key or move a mouse to  
wake it up.  Pressing a key or moving the attached mouse does  nothing.

I have turned off  apmd for all initialization levels.

/var/log/Xorg.0.log has warnings  about the TTF and  CID fonts  
missing and

(WW)   Open  APM failed (dev/apm_bios)  (Nosuch file or directory)
I found this on another RedHat system of mine.  The file belongs to

dev-3.3.12-1.i386.rpm

When I try to install

rpm -ivh dev-3.3.12-1.i386.rpm
Cannot install the dev package:  mounted  devfs  detected.

Any suggestions.
...