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It could be two things. 1). The video card is set to a resolution the monitor does not support. 2). The monitor's power supply is bad. You can try to boot into rescue (or "safe") mode, and adjust the video card to a resolution the monitor supports. OR, power supplies usually go bad because capacitors bulge or otherwise go bad. Most monitor power supplies are hard to get, so people typically repair them. If you disassemble the monitor shell, you can see the power supply (where the AC cord goes). You can look at the metallic, cylindrical looking things with minus signs down one side, and if they look bulged on top, you can replace them. You can get replacements at mouser.com.
The picture board on your monitor is bad, since it goes
off after few seconds and the power led or button is on, it means the
board of your monitor has developed fault.
The best thing for you
do now is to take the monitor to a local repairer or service center within your vicinity
to help with the replacement of the picture board
because the fault is not something you can fix yourself, in order not to
Once the 4 screw at the bottom of the screen has been removed the frame surrounding the lcd should slide up and away. The display itself is fastened to the plastic back by 6/8 screws be careful when removing the lcd screen since it is still attached to the electronics in the back by cable connectors!
A lot of times this is caused by bad caps on the power board, at least with certain other brands. Mine did this when I got it as a DOA donation. If another monitor works fine on your PC as suggested, it would be worth your time to open up the back and check for any capacitors that are swollen on the top or bottom or leaking (worse). If you don't want the hassle of replacing these or are unsure of how to solder/desolder, please don't just throw it away... they are filled with mercury vapour and should be disposed of properly, or FIXED. There ought to be someone local who knows how to do this... if not, hit me up.
Your first step in troubleshooting this problem is to plug in another monitor to your computer. If you are having the same problem it is related to your computer. If the second monitor works fine then your original monitor is shot.
my monitor is 17'' lcd...... mag innovision model: LT716s..before was working well but now the lcd monitor don't to turn or either the led doesn't turn or make any sign.... no matter whta the lcd stay blak,,,,,do not want to turn on....