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This eventually happens to all CRT monitors. Either the flyback transformer or some other critical componant has failed, and the screen cannot produce a picture. It might be an easy fix, but it would be better to get a new one.
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.