The backlight tube at the bottom of your monitor is not lighting. I could be that it's burned out. There are various tutorials on the internet (try http://www.inventgeek.com/Projects/shorts/lcdfix.aspx) to guide through replacement. It could also be the transformer board that powers it, but I've never seen just one light go out.
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You will have to open it up and inspect the inside for capacitors with bulging top or seal, or leaking caps first.
Report back what you find so we can guide you further. It can be bad caps, transformers, transistors, bad solder joints, etc.
You can buy replacement board from here (must verufy which version you have): http://www.lcdrepair.us/Invpowersupply.html
See soe pictures here as a guide to see what goes wrong with Dell and other monitors: http://s807.photobucket.com/home/budm/allalbums
Your resolution is probably not set correctly. That monitor can only support a resolution of 1024x768 - so to change that, you'll need to go into Start - Control Panel - Display Settings, and then click on the settings tab, and near the bottom where it says "display resolution" drag the slider until it says 1024x768. Press apply or ok and see if that helps.
That's the buttonsd on the monitor, not the PC.
Press the [menu] button on th emonitor.
The screen will show the labels of the buttons now.
press the "arrow" to position to the brightness setting (the "sun" icon)
press the minus [-] button to dim
Press [Menu] to save & exit the OSD (on screen Display)
please check out ur monitor setting such as brightness, colour.
Also check the ECO setting & menu part.
These all are seen on the front bottom of ur monitor screen.
If all are perfect but the problem remains same then there is only 1 soln on that is to show it in repair centre.
If the screen is not completely black (i.e. just very very dim, turn the lights off to see) try using the controls at the bottom of the monitor to reset to factory settings (all settings). I have had this problem with two dell monitors so far and this seems to work.
I haven't seen this particular monitor. It may have deeply recessed black screws, or possibly even Torx screws. Try a #2 Phillips and see if it engages firmly. If not, try a T-10. Once you get inside, you will need to remove the power supply and main board to get at the LCD panel. Locate the inverter circuit - it will have two Teflon insulated wires going to (usually) the bottom corners of the panel. It may be part of the power supply board. Every LCD display I've seen so far uses pink colored insulation on those wires. It is possible that the inverter has failed, but most of the time, it's the fluorescent tubes inside the back of the panel.
Getting at the tubes without breaking something is not a trivial task. You will most likely need a #00 Phillips screw to remove the shield metal. Observe anti-static precautions from the moment you open the monitor. Be patient, and keep track of every part or connection you remove. Do not remove the LCD driver circuitry (generally at the top) from the panel. The tube(s) are usually at bottom, enclosed in a sheet metal reflector held in place by the bottom section of the thin metal frame around the panel, just inside a flexible white plastic sheet that covers most of the back of the panel.
You can get new backlight fluorescent tubes from www.lcdparts.com. This website has links to some very helpful pages on repairing LCDs. Note: replacing the tubes involves some rather delicate work. If you are nervous, twitchy or clumsy with fine work, you'd be better off to hire out the job. Be very careful not to rip the rubber insulators on the ends of the tubes when you slide them down the insulated wires to expose the connections to the tubes. You have to attach the wires at just the right spot or you won't be able to fit the insulators back on and get the new tubes to go into the LCD frame - and you can't apply heat to the wires for more than 4 seconds at a time. I've done a number of them successfully, but have occasionally had to try several times to make the connection sufficiently small and short.
Does sound like a power issue. Assuming it's windows xp, you can check to see if it is a poiwer management setting:
Go to start, settings, control panel, display, and on the 'screen saver' tab at the bottom should be the "monitor power" area, click "power".
There is a power schemes area there. Check out what your settings are. Laptops often have settings for when plugged in versus when unplugged; when troubleshooting this make sure you are positive about if you are 'plugged in' or not as it will affect settings! :)
(On Vista go to Control Panel, Power Options; same thing, change your settings there)
Chances are the driver tabs inside from the panel to the internal controller board have failed. This is the actual controller board that the internal video card connects to (hidden under the silver cover on the back of the physical panel).
It is not a cheap repair, and it is normally best to source another panel, or just replace the monitor all together.