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This is a backlight problem. The picture is there but there is no light from behind the LCD screen. It could be due to faulty capacitors, which are easy to replace. It could be a faulty Inverter transformer, which is harder to fix but he backlight controller board can usually be replaced at a reasonable price. If you have soldering experience you may be able to replace the faulty capacitors - look for capacitors with bulging tops.
Repalcing the inverter board in a job for someone with electronics experience. You can buy a universal inverter board for about £15 to £20 from e-bay.
20 inch monitors can be bought for about £100 to £150 so you need to decide whether it is economical to repair.
I hate to "Rain on your parade" as it were, but at 5 years old, and the fact you have had a "Catastrophic Failure" really puts this monitor into the "Should-we-spend-good-money-after-bad" Really once a failure such as this occurs, it often places so much stress on the "Other" components, through the massive current draw, thats caused the initial failure. That it will just "Chain Fault" once repaired. This is in my experience anyway.