Try puting these in the appropriate places in your
XF86Config (assuming you have 4.x.x)

<snip>
Section "Monitor"
        Identifier "MyMonitor" # or whatever you call it
        VendorName "Unknown"
        ModelName  "Unknown"
        HorizSync 30.0-50.0
        VertRefresh 50.0-90.0
        Option "dpms"
EndSection
</snip>

<snip>
Section "Screen"
        Identifier "Screen0"
        Device "Your device" #enter graphic device identifier
here
        Monitor "MyMonitor" # or whatever you call it
        DefaultDepth 16 
        Subsection "Display"
                Depth 16
                Modes "1024x768"
        EndSubSection
EndSection
</snip>

Good luck
Lionel

--- Franco Facioni <[EMAIL PROTECTED]> wrote:
> I don't have redhat... I have Mandrake 8.1. I tried
> with another monitor 
> and everything worked fine.
> The problem is my monitor... I can't get it to
> work... I tried fooling 
> around with xvidtune... but as soon as I press NEXT
> (resolution), the 
> screen turns black...
> can it be that my monitor supports 1024*768 in ms
> windows, and can't do 
> more than 640*480 in Linux??? ----> sound pretty
> illogical!
> I tried running SuperProbe (a display recognition
> tool (or so it seems)) 
> and it said "Generic VGA or Unknown SVGA"
> Any ideas?
> I tried everything I know (which is very little
> since I installed Linux 1 
> week ago).
> Please help me!
> 
> 
> At 01:14 AM 10/11/01 -0400, you wrote:
> >try Xconfigurator
> >www.redhat.com - go to search and type X Config in
> the search area.
> >
> >find documentation there.
> >
> >-----Original Message-----
> >From: Franco Facioni [mailto:[EMAIL PROTECTED]]
> >Sent: Thursday, October 11, 2001 3:53 AM
> >To: [EMAIL PROTECTED]
> >Subject: [Newbie] Video resolution problem
> >
> >
> >I'm new to linux...
> >I installed and cannot get a display bigger than
> "640*480". When I start x
> >my monitor goes black and the only way it works is
> by pressing "ctrl alt
> >-", but then I have to scroll to see the whole
> screen.
> >My monitor has a max of 1024*768 (which worked in
> ms windows). An H freq of
> >30-50, V freq 50-90.
> >I have a Viper 330 8mb...
> >I tried with "xf86config". But it seems to change
> nothing...
> >Please... I need help!
> >
> >_______________________________________________
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> see:
> >http://XFree86.Org/mailman/listinfo/newbie
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> 
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