Friends,

When i run my Linux PC and go to in the Graphical mode then an error is Occured :

"Sync. Out of Range"

But i can work in text mode easily .What is the problem ?

The sync is out of range for graphics.

Take a look at /etc/X11/xorg.conf and check the monitor settings there against what your monitor does. However, it could just be that your video card does not support the rate you have set.

BTW: I cannot be more specific because you havn't told me anything about your computer or monitor. I need to know about the video card and the monitor.

Dear Simon Bridge ,

My Monitor is SAMSUNG
and
My PC is "DELL" Brand PC .

um "more" info is the keyword here but try this when you are in graphical mode (and sync out of range)is on the screen
press "ctrl" + "alt" + "+" (key on the numberpad) at the same time,
this will cycle through resolution settings.

a handy program for the console is midnight commander
if your using a debian based distro the type
#sudo apt-get install mc
then
#sudo mc
and take a look in your /etc/X11 directory for a file called XFree86.conf or xorg.conf
highlight it and press F4 to enter editing mode

in that text file you will see a section like this

Section "Monitor"
Identifier "left"
HorizSync 30-75
VertRefresh 75
Option "DPMS"
EndSection

the VertRefresh is the value you would need to change i find any thing over 85 is overkill IMO.
after any changes you made press F2 to save and F10 twice for the exit dialog then restart x

You'll find that Smasung make a very large number of monitors. To advise you for your specific monitor, I need to know what kind of Samsung you have

Similarily - DELL assemble a wide variety of PCs. I need to know what your computer is made of. What is the video-card for eg.

- but all I would do is look up the specs on the web to see what xorg.conf will need to know.

You can do this yourself.

have you tried?

BTW: also read the advise in my sig. I don't know how you expect assistance with the little information you supply or if you will not even let us in on what you have tried to fix the problem yourself.