strange Problem with Monitor on RH 9

[linux r]

On Sat, 30 Oct 2004 21:47:41 +0000, othma El Moulat <moulatm at menara.ma> wrote:
> Hi guys;
> I'm facing a realy strange problem wih my PC's monitor when running RH 9...the
> screen monitor looks fuzzy unstable and keeps waving ...I don't know from
> where this problem came! but what is strange about it is that this problem
> disappeare when i boot on the windows partition box on the same machine!
> Important thing to say: I was absent a while when my RH 9 was running and when
> i came back i found the PC shut down without any body touches it !( STRANGE
> !!) this might be the source of this problem...
> I don't know how to proceed to fix this malfunction...please help!
> 
> thanks
> othman.
> 
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Possible areas to look at:

!. Electro magnetic interference from anything in the environment.  Is
there a fan, another monitor, or other elecrical devices nearby?  If
so, remove them and retest.  Could be a simple fix.  (not to insult
you if you already know this - I don't know your knowledge level)

2.  Ok, so you can run windows on it so that means the hardware is
most likely just fine.

3.  Are there any power save features happening in the bios?  A box of
mine does 'sleep' power save by default, you have to go into the bios
and make sure your monitor isn't getting a bit too narcoleptic.  :)

4.  Reboot the machine and try to get to a command prompt where you
should be able to log in normally.  If it doesn't take you to a
desktop, then you have a problem with the X Window configuration.

5.   man Xf86Config will give you a lot of information.  Read that thorougly.  

6.  If you can get a command prompt, try to do the command 'startx'. 
See what happens and let us know and we can go from there.

7.  How long was this working prior to stopping working?   If you
recently installed it, you may have chosen the wrong horizontal and/or
vertical refresh display settings for the monitor.  How old is the
monitor?  We need more information.

8.   Examine /etc/X11/XF86Config closely.  This is very similar to the
RHEL3 version of the same file.    Look for a section headed
'Monitor'.   You can then use vi or another editor to change the
values to something LESS than what you find.  For example, it might
say:

Horizsynch      35.0 - 40.0         # (change this to 30-35, for example)
VertiRefresh   40.0 - 50.0

Alternatively you can run the command redhat-config-xfree86; it will
edit the files behind the scenes based on the choices you select.  If
you can't find your exact model listed, my recommendation is not to
probe unless you know what you are doing.  Try your generic options
first; they will often fix this sort of thing.

Hopefully that will give you a start.  Cheers,



-- 
Marc




Wealth is the product of man's capacity to think. 
Ayn Rand