Benq FP222W Every time I switch on, or the signal to the monitor changes, the message "Input D-sub" appears. This is very distracting. Is there any way to stop this? Thanks Don all of the monitor settings that are normally displayed by pressing the buttons under the monitor keep flashing up ans switching from main menu,Miscellaneous, input select ,color etc. as though someone is actually pushing the buttons. makes using the computer very hard

Check if you dont have a timer shutdown on the menu.

Electronical Problem:
When it have this kind of error is a problem of the powerboard.
Anyway you must open it and look at the all capacitors and if are them inflated, if them are inflated must change them.

But can be a problem with inverters... control the transistors - MOSFET on the powerboard.

Good luck!

from user manual troubleshooting section
(When connecting D-Sub cable) Check the signal cable connection. (When connecting DVI cable) If you still see an error message on the screen when the monitor is connected properly, check to see if the monitor status is set to analog. Press Source button to have the monitor double-check the input signal source.

Source button Activates a highlighted menu item.
/ Push the 'SOURCE', then selects the video signal while the OSD is off. (When the source button is pressed to change the input mode, a message appears in the center of the screen displaying the current mode -- analog or digital input signal.) Note : If you select the digital mode, you must connect your monitor to the graphic card's port using the DVI cable.
https://images10.newegg.com/User-Manual/User_Manual_24-001-063.pdf ninth page in user manual
source button fourth from the left when facing monitor. looks like a box with an arrow pointing left.

If there's no backlighting but you can see the image anyway, then your monitor might have a defective inverter. The inverter is responsible for providing power to the backlight, so if it is defective, the light won't work and it might need to be replaced.
An LCD inverter looks something like this:



You can easily find inverters for sale online, but be careful: you have to find the exact same inverter for your monitor, or it may not work.

You normally don't need any drivers for LCD monitors. The resolution should be 1440><900 or higher.

Samir

LCD parts are available from these WEB sites :- www.lcdparts.net

http://www.nylaptopparts.com/

http://www.yallstore.com

http://www.shope2.com/

A bit late I know, but I have the same monitor with the same problem - see here . Problem with mine was one of the backlight assemblies had died. No mean feat to replace these. If you can do it yourself it'll probably cost around $50, otherwise it's for the scrapheap.

After changing the caps, do you get steady 12~18vdc feeding the inverter circuits? Inverter fuse OK? It can be bad transformers, or lamps also. Pictures will be great help. See where I post my pictures: http://s807.photobucket.com/home/budm/allalbums

If screen says "Signal cable not connected " all the time till power led switches to Amber chances are monitor is ok and problem is with graphic card or cpu.Connect to Known working CPU and confirm that monitor is the problem.
If same problem persists on another working cpu after changing signal cable,the interface board in the monitor could be defective.
Samir

PLease rate solution and provide feedback.

Hello Guys!
The problems you face may relate to the key switch panel,one or more of the key seems to be leaky.Clean all switches with switch cleaning fluid like WD40 or most reliable solution is replacing all these switches.
Please rate this solution.
Samir

Try putting the resolution on 65hz if that dont work then try
different resolutions on the monitor. Right Click in a open area on your desk top and click properties and the click the monito tab to change the resolutions.