I have two BenQ FP591 15" both of which had the same EXACT problem. The problem is that the LED light on my monitor flashes green and orange when it's powercable is plugged in and my computer is turned on but the monitor wont show anything. I can hear a faint 'screeching' sound everytime I try.
As I said before, i have two exactly same BenQ FP591 15"'s and the same problem occured with both.
I've had them for about 3-4 years now..not sure if the circuit board inside the screen needs cleaning or repairing...
I'm stumped, help appreciated.
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Strange that both should show the same symptoms
don't you think?
Have you changed anything computer wise?
Graphics card or resolution?
Screeching noise is a puzzle too.
How are they powered - internally or via a separate power supply?
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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.