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If you get the same result with the other monitors, you may have to replace your VGA card.
First turn off the system.
Remove the VGA card from your computer.
Clean it and fix it again. This might fix the problem.
If you get the same result, replace your VGA card.
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
In Win98, you will get only 16 colors if you don't install the VGA driver. It is not a problem with your Monitor.
Install the VGA driver. If you can't find the driver (we may be able to help to find it), try replacing the VGA.