How to get sound working on a Benq 17" FP71E?

Try on putting a headphone jack similar to the the image:

Put it on back of your monitor's audio slot. It is usually colored green and then put the other end to your computer audio slot. Thank you

You need to open it up and inspect the PCB for bad solder connection or over heated components. BenQ made monitors for Dell, so look at some pictures of failed Dell monitors here to get some ideas what could have gone wrong with your monitors, post back what you see so we can guide you further: http://s807.photobucket.com/home/budm/allalbums

Try checking the settings in properties for this device to make sure they are as you left them. YOu can also uninstall the drivers for the card and reinstall them to see if that takes care of the issue.

There are 4 pieces 2 each around yellow invertor transformers.
Check visually for darkened back of the transistor.For reliable testing you need to desolder and test with an ohmmeter.Also check the FET Fu9024 or D10Pf for similiar problems.
What is your actual symptom?
Samir

Hi...there,
With AC adapter it's to your left, a rectangle piece. Without, it's under you power supply w/ built-in inverter... the capacitors look like a tiny battery on the side it have voltages size ( example like 1000uf 16v ) Good lucks, have a nice day!

That Seems to be a panel problem.Benq provides 3 year warranty,Try contacting local BenQ service centre in your country.

Samir

Mail me what you need samir @viziks.com.
Samir

The video card driving the monitor or the video section of the monitor circuitry is getting bad, probably a capacitor on the board.
srich

ive solved this by taking out my vga cable and plug in my dvi cable and ive done some settings on my ati control center i have x1300 512 mb all you need is change your settings that this lcd dont support plus this monitor is huge!!!!!!!!! thank you for your support lol

Front panel switches are defective.
Contact BenQ,Normally company offers 3 year warranty.
Samir