You could try pressing the auto adjust button (simply says 'Auto'), and see if that changes anything...don't know if this will work, but it is a start.
SOURCE: monitor problem: not optimum mode
It appears your display adapter is set to a different refresh frequency or resolution,
either accidentally or due to some power glitch.
If you cannot set the resolution because this message is preventing you from getting to the
display settings window, try rebooting your PC in Safe Mode. It'll take a while longer
than usual, but when you're finally running, try setting your display adapter to the
1280x1024 60Hz settings. This is available under "Advanced->Adapter->List all modes".
To reboot in safe mode, try pressing the PF8 keys repeatedly after the POST messages
disappear just after turning the power on. This only works if this key is enabled to
operate from the BIOS settings.
To get to the BIOS setup, Look at the first messages displayed on your screen indicating what key to press. It's usually the Delete or PF2 key, but different BIOS manufacturers use different keys.
Once inside the BIOS setup, find the way to enable the PF8, PF9, PF10, keys. Save your
settings and reboot.
Now you may try PF8 again to go to Safe Mode.
Good Luck!
SOURCE: Samsung SyncMaster 713BM
Hey!
Follow the instruction below to solve your problem:
Restart your computer and enter Safe Mode (press F8 right as the computer starts booting up. Choose Safe Mode in the menu, press Enter twice).
While in Safe Mode, open Control Panel and go to Add/Remove Programs (Programs and Features on Vista/7) and uninstall the display driver software/drivers.
Restart your computer and boot normally. Now you should be able to see everything. Things might look bigger and uglier, that because there's no display driver installed. All you have to do now is reinstall the display driver. Use it's original disc or go to the manufacturer website and download the latest driver.
Good luck!
Pelu.
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