Monitor won't display image

ok i have a little issues i have an HP f1905 lcd monitor and it used to display the image just fine. but, now you have to press the power button for a couple of hours or more to get the image to show up. plz help me fix this. i took the monitor apart and didnt find anything wrong with the wiring at all. i tried new cables and different computers i even tried the DVI port didnt work either
 
Taking into account what you have already tried I would think it is highly likely that the monitor is due for replacement.
 
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