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Most likely, this is failing "inverter."
The backlight of the monitor (that makes the image visible) is controller by a special chunk of electronics called an inverter. They tend to fail over time. The symptom is that the backlight either never comes on, flickers, or shuts off after a short period of time.
It is a moderately advanced repair job to change out the inverter, but you can usually get the part on eBay. Search for the exact monitor model number and "inverter".
The 2001FP has six lamps and the inverter is fairly expensive. You might be better off putting that money towards a newer monitor.
Although this site does not list the 2001fp speciffically it was very helpfull for me to learn about caps on power supply boards. Follow the steps of the "tutor" at the bottom of the page (after the testamonials) and its pretty straight forward.
that is a fault of signal cable bend it and see is there any difference in the color then change hte signal cable problem will be solved if persist then open the monitor and look any dry solder inside the pcb
First remove the four screws behind the stand mount on the monitor. Then turn monitor vertically so thet the bottom is up. Next look for slots betweem the portions of the srame on the bottom. Use a slotted screw driver to pry open the bottom. Becareful to not damage the plastic. As bottom is opening pry around the entire frame it will come loose. Make sure you place the monitor on a table covered with a towel in the final process to un clip the case.