Dell monitor #2007shortedoutcannot get picture or soundd

It can be bad solder joints, shorted transistors, bad fuse in the inverter circuits, bad caps, worst case will be the lamp assemblies.
See my pictures here:
http://s807.photobucket.com/albums/yy352/budm/DELL/Dell%20E173FPb/

Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

That cap is for the Primary power supply switching circuits. How is the DC secondary side, no blown fuse, shorted transistors in the inverter circuits? Pictures will help, [email protected]
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
It may have the same bd as DELL since BenQ makes monitors for DELL and HP.

You have either power supply or inverter circuits failure, worst case will be lamps.
Most common failure in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed Dell monitors to get some ideas what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.
http://www.badcaps.net
http://en.wikipedia.org/wiki/Capacitor_plague

Boards: http://www.lcdrepair.us

Most common failure in this model is shorted transistors in the inverter circuits caused by poor solder connections, see pictures here for guide: http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

Power LED is turning on and off because the power supply is in shutdown-restart mode becuase it sensing over current draw, it can be bad caps in power supply, shorted tramsistors (c5707) in the inverter circuits. See pictures: http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/
Check the fuse and the transistor out (check Emitter and Collector pin for short circuits)

You need to chek for shorts between Emitter and Collector of the transistors C5707 in the inverter circuits, and also check the fuse PF751 for less than one Ohm resistance. Here are the pictures: http://s807.photobucket.com/albums/yy352/budm/Dell%20E15x%2017x%20series%20PWR%20INVERTER%20BD/

http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

Post back what you find so we can guide you further.

More likely to have problem in the inverter circuits, check for short between Emitter and Collector pin of the four transistors as shown in the pictures.
http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

No caps with bulging tops? Listen real close to the power supply section for fainted clicking sound, if you do hear that, then the power supply is in shutdown/restarting mode either due to bad caps or short circuits in the inverter section. Post picture will help, see eaxmple of failed monitors due to bad caps: http://s807.photobucket.com/home/budm/allalbums

Check for shorted out transistors (4, c5706/707) in the inverter transformer driver circuits.
http://s807.photobucket.com/albums/yy352/budm/Dell%20E173FPb/

It sound like a short circuit. I had this problem with 1907FP model. It had an USB port on the monitor which got damaged and it was shortening to the groung. In your case it might be a bad internal power supply board.