MagicBright is on my screen and will not go away

You cannot exactly stop it but you can configure it. See the link I included for the complete instructions and screenshots.

You probably have it on Dynamic settings as it would change constantly. I would suggest to keep it under "Standard" or "Custom" if you like your own setting to be permanent.
Configuring SAMSUNG MAGIC Bright Samsung Support Singapore

Can you please clarify more?

sounds like it might need a cleaning. are the buttons hard to push or are any of them giving you a different feeling then the rest?

unplug then open the case then remove the little white plug from rear of switches job done no power light or buttons but picture is fine ; )

Solution: Unplug your monitor for a couple minutes, plug it in and magic, it is fixed.

It may have unstable DC voltages due to failing DC filter caps which is very common problem to all LCD monitors as shown in my albums.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

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.

1. Lock : Hold down the menu button for more than five seconds to activate
the OSD adjustment lock function.

2. Unlock : Hold down the menu button for more than five seconds to
deactivate the OSD adjustment lock function.

Though the OSD adjustment lock function is activated, you can still
adjust the brightness and contrast, and adjust MagicBright ( )
using the Direct button.

Found at: http://www.retrevo.com/support/Samsung-713BM-PLUS-Monitors-manual/id/2994ag905/t/2/

Hope this helps and please remeber to give me a rating, thanks!

OpenSource13

Click the top button on the side of the monitor to open the monitor's settings. In the "Picture" Settings, scroll down to "MagicBright" and open those settings. Chances are you have it set to "Dynamic Contrast". Switch that up to any of the other settings and then it won't try to adjust the gamma based on what is on the screen.

Hope this helps, I struggled with the same problem for quite a while until I found this setting.

I found this tread on another forum. I found it may help you to read it for you monitor problem. It makes sense to me so I'm passing it on.

http://www.daniweb.com/forums/thread17104.html

hold the menu button down until the menu disapears again