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Due to no model number I will assume it has bith digital and analogue inputs.
If possible, connect another cable the opposite of what you are using and try it again. (IE: if you are using a DVI cable now, use an analogue instead)
It is possible that the internal video card of the monitor has been shorted out and will not accept a signal any longer.
On the upside, if that is the case, the digital and analogue circuits are normally seperate to each other so losing one dosn't mean losing both. It could also be the output section of your PC's video card that has suffered the same fate so try the other video port (if you have 2 on the same card) or try another video card.
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Hook a spare monitor to the computer, if the same symptoms occur the problem is the Video Graphics Card in the computer, but if the picture is okay, it is clearly the LG Flatron that has the problem, and if possible sub the video cord from the computer to the monitor just to be sure.
you go to control panel starting your pc ,, then display settings,, from there,, screen saver tab, then make screen saver to none, and click on button power,, there you make everything to never,, and then see. it should work good
What brand is your laptop? Sometimes you have to manually switch between your laptop and an external monitor. Usually pressing the "CTRL" button and "F5" might work to switch the signal from laptop external.
Your monitor goes to Power Saving Mode when the signal it is receiving is not correct.
In all probability this is not a problem of the monitor itself, rather you should check the connections and the computer the monitor it's connected to. For example you could try a different RGB cable and try it in a different computer.
Right click on your desktop>Properties, then click on Screen saver tab, then at botton of the box you should see 'Monitor Power'.
Click on 'Power' then Power schemes tab.
Look at 'Turn off monitor' and set to 'Never'