I have a Samsung SyncMaster 940BW. My young son played with the menu bottons and I cannot restore the screen to its original settings. How do I restore to factory settings?

Needs new power supply board; $22.99 on Ebay http://www.ebay.com/itm/LCD-Power-Supply-Board-BIZET-17-BN44-00123A-For-Samsung-940N-940BW-740-740BX-/231287138720?pt=LH_DefaultDomain_0&hash=item35d9c9a9a0
Simple to replace, hardest thing is getting the cover to snap open. GHoogle for instructions.

Hi there,
You can try to disconnect VGA cable to see will the notification "no VGA signal" appear on screen. If so the problem could be with PC graphics, else it is power board problem bad caps.Thanks

you might have a problem with the LCD"s firmware you should go to a service and have it updated its cheaper than buyng a new monitor

Good Morning!
One thing that I have noticed when I change settings on my monitor is that sometimes it needs to be re-aligned. Thankfully this is very easy to do. There is a button on the bottom right of the screen that says "Auto".
Press this button and you should see the screen shift and become sharper.
If this does not work, you may want to change the monitor back to the default settings. You can do this by navigating through the menu: Press the Menu Button -> Select "Setup" from the on-screen menu -> And then separately select "Image Reset" and "Color Reset".
Please feel free to comment back if this does not solve your problem.
Thanks!

OSD Lock & Unlock
When pressing the AUTO button after locking the OSD
When pressing the MENU button after locking the OSD
This is the function that locks the OSD in order to keep the current states of settings or prevent others
from adjusting the current settings.
Lock : Hold down the MENU button for more than five (5) seconds to activate the OSD adjustment
lock function.
Unlock : Hold down the MENU button for more than five (5) seconds to deactivate the OSD adjustment
lock function.

Please leave rating if it helps.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

The screen went white can be due to failed T-CON board or failed power supply, I would inspect the power supply and the ribbon cable between the logic board and the LCD panel.
Failed TV and monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

the easiest solution would be to epoxy the mount back though you may loose ability to tilt monitor, be sure not block any air holes. when setting together tape it to proper spot and let set for recommended time on epoxy(get at hardware store).

Try removing signal cable and refitting at both ends.
Signal cable also could be faulty.
Samir

bring it to the service center for a check up

White screen is normally a defective panel.
Samir