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Ok, another words, monitor powers up for few seconds and shuts down by itself. If green LED on the front panel turns off as well or stays on? If stays on, then inverter turns into protection mode because of old backlight lamps. If it turns off in same time with an image on the screen, then there are some bad electrolytic capacitors in the power supply.
The monitor you have has bad components on the circuit boards inside. This is a classic problem with all LCD monitors. I rebuild them on a daily basis so I recognize the symptoms. I would suggest finding someone who can do component level repair on the circuit boards inside. I also suggest not trying to repair yourself as there are many breakable components to them as well as components inside that do not like static electricity discharges.
The monitor is going bad. Either going to be a bad screen or a bad inverter. Also Since you tried it on another computer and its still giving you the same symptoms, you know the computers are fine. To be sure, try another monitor on your computer and if you get video on the new monitor then thats another way of verifying that the dell monitor is bad.
what happend is your monitor cought the brown out and the power supply capcitors are not defective and what that means is the monitor needs to be repaired there is no quick fix please rate accordenly thanks.
i have the same issue before with my DELL 2001FP, I replace the 3 capacitor on the board that look like defective because the top is look like swolen, it should be flat. I replace it with the same value and now the it works better.
This is most probably cause by one or more Faulty Electrolytic Capacitors, I find these are the MOST commonest form of "Fault" in these LCD's TFT's units. I ususally simply replace "On Spec" all High Value Electros, in fact ALL Electro's are suspect and often I just "Shotgun" and replace 'em all. Usually fixes all problems. Always use High Temperature Caps.