Sounds like the red guns aren't firing. Check the pins on the VGA cable to make sure that none are bent. Also plug in a different video card (or plug the monitor in to a different computer). If the monitor is fine, then you need to replace the video card.
If they aren't, you're looking at a fairly expensive repair.
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1. Mostly Loose contacts in video section that means CRT Neck board dry points checke it.
2.Pl check VGA Cable RGB signal pins 123 to ground 75 Ohms (on OK condition).
3.check 5v supply
4.check SDL and SCL signals.
as u told ur monitor is excellent only... it is in good condition no problem will be there ... may be there is problem with the operating system just try reinstalling it... ur problem will be solved...
This problem may arise from monitor as well as from cpu.
First of all check it by unplugging the VGA monitor cable.
This will display the "Check Signal Cable" depending on the model of the monitor. But a message will appear rolling on the screen, if it is not a very old monitor.
If the message is appearing OK and green light is continuously on, that means ur monitor is working fine.
The problem may be with VGA cable or with the booting of CPU and probably the RAM. Recommended solution is to reconnect the RAM and then try, if u think u can do. Otherwise call a hardware engineer.
If there is no message and still the light is turning green and yellow. That means the problem is definintely in the monitor.
I would first verify your system power settings (in Windows XP go to control panel, power options, then verify that nothing is set that could activate your monitor to a standby mode) - other versions of windows have something very similar. If all of these settings are correct, then unless the monitor is not working as required when switched on, i would recommend just leaving it be, possibly just take the time to unplug the monitor power lead instead of just switching it off.
If however you feel you must fix this problem, try:
for this model of monitor you will need the serial or FRU number in order to define the exact model.
There is probably some electronic malfunctions inside your monitor. Since I will not be able to actually check your monitor, the best solution for this is bring your monitor to a qualified TV/CRT technician in your area for proper diagnosis. He's the right expert and the second opinion to that kind of problem.
Problems regarding inside the monitor are usually not fix-it-yourself kind of thing for non-expert like you compared to software problem, which can be mostly fix by yourself guided by an expert.