SOURCE: 17 inch dell flatscreen monitor stops in its tracks
Sounds like most of the monitor's circuitry is working except for the backlight. If you place a flashlight on the screen you may be able to see your desktop items in the light ring around it. This doesn't fix the problem but it will tell what is wrong. The price of some monitors is low enough now to make this one not worth spending on for repairs. You could sell it as broken on ebay and use the proceeds towards one of the new ones.
SOURCE: something is wrong with the power cord where it
You may be able to re-solder the connection to the plug on the board-probably wasn't soldered correctly at the factory.
SOURCE: it turns black, i think
Look for bad caps as shown here: http://s807.photobucket.com/albums/yy352/budm/DELL/Dell%20E177FPv/ Basic LCD monitor and TV troubleshooting guide: Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague 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.
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/
Replacement board: http://www.lcdrepair.us
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