How to change screen resolution

[Triadi Krisnawan]

Dear Experts,
 
My machine is using Fedora. The current resolution display is 1024x768_60Hz and it shows flickerring every now and then.
I know that the max screen resolution can handle is 1280x1024_60Hz but I cant change it by simply go to display preference. 
Under the display preferences the max resolution option is 1024x768 which is currently use.
 
At the back of the machine, the display output is DVI port but then the installation here is converted to VGA port (via DVI to VGA adapter) and from the VGA port comes to a VGA splitter then connected to 3 monitors. 
 
Yesterday I did try to modify the xorg.conf file as following (the one that I added is on the red)
      Section "Monitor"  (mon "0")
         ...
         ...
         Modeline  "1280x1024_60"
         Option     "PreferredMode" "1280x1024_60"
 
     Section "Screen"
         ...
         ...
         Modes "1280x1024_60"
 
>From the above list, the first modification that I enter on the xorg.conf file was the Option under the "Monitor" section and the Modes under the "Screen" section. After I rebooted, the resolution was not changing. It still doing the same.
Then After I added the "Modeline" and did reboot. The system was hung up at the fedora symbol. 
I managed to restore back the original xorg.conf by went to the single user mode. 
 
It's now up and running again with the original resolution 1024x768 and it still flickering.
 
Do I enter a wrong format under the Modeline? Or is there any other way to set the resolution up to max in fedora?
 
Please kindly help,
Triadi 		 	   		  
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