Hello,
This is a common indication of bad filter capacitors on the power supply board. Below is a picture of the power supply board with the problem capacitors circled in yellow. The repair is easy, you just need to replace those capacitors and the unit should be as good as new. Below the picture is also a link to a full repair guide showing how to dis-assemble the monitor and what parts need to be replaced. the repair guide has a full parts list for the job.
The repair guide can be found here:http://www.ccl-la.com/blog/index.php/repairing-a-dell-1905fp-1907fp-lcd-monitor/
You will need to open it up, just be REAL CAREFUL when you crack open the case, you may end up breaking the cable attached to the front panel switch assembly, look for bad caps, bad solder joints, check the inverter transformers and transistors. Problem can also be caused by bad lamps (bad solder connections). See pictures here to see if you will want to try DIY: http://s807.photobucket.com/albums/yy352/budm/Dell%201905FP/
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