I have a 19" Dell Flat Panel monitor that has recently developped horizontal gray bands across the display. The bands extend from all the way across the display, some are wider than others with the widest one being about 1/2 a centimetre. This problem seemed to develop after the monitor had been turned off for about a week but that fact could deffinitely be unrelated to the problem. The bands are only visible on white backgrounds - my wallpaper, for example, is darker colours and I cannot see the bands there.
My name is Richard and I am part of Dell's Online Community Outreach group. Looking at you monitors issue; it would be most advantageous that you contact our technical support.
Your monitor seems to be a fairly now model and is probably still under warranty. Call 1-800-WWW-DELL and provided the technician the PPID number on the back of the monitor. The Dell rep will be able to determine your warranty options.
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Back-light fault. Contact any service technician. The panel might be taken out for repair. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
I would check the cable and connector pins first.
Then I would suspect there's a problem with the video signal board inside the monitor.
It could be the LCD panel controls, too. That would make the unit beyond economical repair unless you got a used one.
Is it sort of rolling almost.
If so you have a few bad capacitors in the power supply that need to be replaced.
If you dare to venture inside you should see 1 or more buldging caps. (bowing upwards on the top)
If these start to fail, then they will interupt the correct flow of power and cause this problem with your panel.
Easy to fix if you are electronically minded, if not, take it to your local TV tech and it shouln't cost that much to have repaired.
Remember, inside these monitors is high voltage that can kill, even if it's not plugged in.