I have an LG 500G 14' monitor which about 5 years old. At present when I want to set the resolution in 1024 by 768, it shows 'out of frequency' message.But earlier 1024 by 768 resolution worked. 40 GB Hard Disk, 256 MB RAM & Windows XP SP2 is in my computer.
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The resolution your computer is sending is greater than the maximum support resolution of your monitor that isn't working or is a resolution not supported. Connect one of the monitors that works and turn down the resolution to something small (800x600 or 1024,768) and then switch to the original monitor back, you should see a picture and can adjust the resolution to something larger that the monitor supports.
your irf 630 is not original purchase it from proper LG authorised service centre it is costly but never become faulty again duplicate mosfet overheats if your green led is on then measure voltage at E.H.T.connect meter at output transister if E.H.T. is producing then meter should show 1 digit if not then 50v will show take care that signal cable should be disconnected if E.H.T. is not producing then check +vcc at horizontal ic it should be 12v. if 12v is not present then check regulator ic 7812 insmps
go to your desktop display properties then go to setting then go to advance then monitor tab chack your screen refesh rate may be 85Hertz.now change rate to 56Hertz and apply.now you change your resolution 800*600 to 1024*768.