There are probably only two reasons for this that I've seen. One is the button is stuck or the button circuit board is faulty. You can removed the bezel from around the screen and operate the control button at the board itself to see if the exterior button was sticking. If this doesn't work, the other cause will probably be in the video ciruit located within the main board and is unrepairable but replaceable.
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Not sure if this is exactly the same as yours your model hard to find I had 2 similar monitors at previous employer and they both operated the same way
Taking a Look
1. Power Switch
Pressing this button turns the display system power on or off.
2. Menu/Select ? Pressing this button pops up the OSD menus on the screen, and used to
select ("Up" direction) the OSD control options on the screen.
? This button is used to select ("Down" direction) the OSD control options on
4. + This button is used to increase the value of the selected OSD control option.
5. 0 This button is used to decrease the value of the selected OSD control option.
Quick Adjustment Function
When the OSD Menu is not active, the following functions are available for the quick
Pressing ? button once pops up the OSD Function Main Menu .
Pressing ? button once pops up the small Brightness icon. Use +or 0button to adjust
the Brightness level.
Pressing + button once pops up the small Volume icon. Use +or 0 button to adjust the Volume level.
Video circuit is separate from the Audio circuit. The main controller may switch to Audio, but if the unit is damaged from a power outage; part of the circuit board may not function. Needs professional servicing.
Have you zapped the p-ram? Hold Apple, Option, P and R keys when you hear the chime. Wait for four more chimes and release.
Try "detect displays" from display preferences. In system preferences, displays, be sure brightness control is turned up.
I couldn't find the information for your particular model, but I did figure out the general procedure for Memorex alarm clocks currently in production:
Make sure power is turned off (no radio or whatever playing). Press the Time Set button (on some models, this is the Skip Search Back button for an iPod docked in the unit).
When the display blinks (on one model, the volume control knob lights up), press the Hour button (Vol. -) to set the hour, then press the Minutes button (Vol. +) to set the minutes. On the model with the light-up volume control, rotate the volume control knob to set the time.
When you have the time set, either wait 15 seconds or press the Time Set button again to start the clock.
Setting the alarm works the same way on single alarm models, but the Alarm Set button may be the Skip Search Forward button. Dual alarm models have separate Alarm A and Alarm B buttons.
Fn + F1
Change Display Device.
Fn + F2
Fn + F3
Fn + F4
Decreases brightness on the integrated display only (not on an external
Fn + F5
Increases brightness on the integrated display only (not on an external
Fn + F6
Keyboard backlit(available only if a backlit keyboard is
Fn + F7
Fn + F8
Decrease audio Volume.
Fn + F9
Increase audio Volume.
Fn + F10
CD Previous - Play previous media file.
Fn + F11
CD Play/Pause - If there is Audio CD in system, Media player will play
Fn + F12
CD Next - Play next media file.