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Right click on the back ground of the computer desktop. If windows XP click properties, if vista click personalise. Now look for settings and move the resolution slider to 1024 X 768. This is the native resolution for this monitor.
If you still have the HZ error, click on advance look for the monitor tab, and make sure it is set to 60Hz
fixing a LCD monitor require you to have some basic electronic know how.. changing the backlight won't be easy as you need to dismantle the whole LCD right to the screen.. But if the display only lasted for few minutes and then the whole screen turn dark, this is due to bad component on the board.. most probably capacitor...
The white glow with no picture means that either the ribbon cable connection between the logic board and the monitor has come lose or dirty contacts, or the LCD Controller (T-CON) board (part of the LCD panel is not getting 5v or 12v depend on LCD panel from the logic board or the LCD controller board has blown fuse, see pictures here for guide (note pin on the LCD board with arrow mark is pin 1 and is the incoming DC power supply line): http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/?action=view¤t=DSCF0881.jpg
You may also want to look for bad caps (bulging top) on the logic board. There should be 5vdc feeding the logic board also.
Dell had a problem with horizontal lines in some of their monitors a little while back. I would try contacting Dell Tech Support to see if your monitor is one of the one effected. I think they were replacing the monitors that had the problem, but I'm not completely sure.
Although I still have the problem to a slight extent (very slight wavering of the vertical lines going from dark to light or white) reducing the contrast from 100% to 80% seemed to do the trick. Although this monitor is on the way out, it has lasted about 7-8 years now, at least it will keep going for a while.