Hello, when i change resolution on my monitor samsung sync master 710v i got the error "not optium mode recommended 1280x1024" or even when i restart pc i got that error. thanks

This is an issue with synchro : one of the screen mainboard components wears out with time.You can fix it by soldering a 50 ohm resistor, as shown here : http://teleservice.xooit.fr/t6017-Samsung-SyncMaster-710V-Perte-de-Syncro.htm

1280x1024 is the native settings for your monitor,and this is why you cant change it as its max for this model.{ It features a 500:1 contrast ratio, a brightness of 290 cd/m2, pixel pitch of 0.264mm, 1280 x 1024 maximum resolution}.........darktowernz