Hi hopefully you can help. The contrast setting keeps appearing and
adjusting itself for no apparent reason. Have tried to recall the
factory setting which it does but it still keeps happening, approx
every 2minutes. Its very annoying.
Have changed the PSU in the tower to a 500W thinking there is not
enough power this did not work. Have reinstalled the driver this did
not work. Unplugged the power supply to my Geforce 7600GS this only
gave me the sentinel warning. Why did it happen all of a sudden, I have
it 3 years without a problem and now out of the blue this. Have
unplugged for a day, this did not help. Have blown out the air vents
this did not help. Any ideas. Im lost. Thanks in anticipation of a
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If you can expose it, examine the ends of the fluorescent tube itself; if there are prominent black rings at the end, the tube is toast.
These cost much less to replace and live only about 4-5,000 hours, much shorter than the inverter board usually lasts.
You can buy these from several US sources; the one I recently used was great and the part was $10:
Have you attempted to enter the on-screen menu system for the monitor? There should be a reset system reset option somewhere in the menu selections. If not give that a try. Also you might want to check your monitor cable. Unplug then replug it in. If you still have a blank screen you might want to try the cable on another monitor if that's possible.
If the cable is not the problem then that leaves the monitor itself or the video card if your system is equipped with one. Check the back connectors and locate the video output plug. If it is located close to the keyboard, mouse, Ethernet and usb plugs it is what's known as on-board video. If it is located below those other plugs it is a video card. Shut your system off and disconnect the power cable. Open up your case and make sure that the video card is seated correctly. They can come loose.
Your only other option is to try your monitor on another system. I really hope something here helps. Good luck
I have a Benq that was continually auto adjusting, I used electronic cleaner spray on all the controls (a good spray) and now there is no problem, suspect the controls were sticking, especially the on/off and the auto adjust button
IT seems you are not technically trained in electronics.In this case it's difficult to explain via this board,Best you find someone to fix it for you,you can try contacting Benq Support locally.
Sorry for not being able to help.