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If your monitor shows a yellow light and it won't turn green, the problem most likely lies with the computer. If your computer is not sending a signal to the monitor, then you have a computer problem. One way to test this is to turn the monitor off and the computer off, too. Turn the monitor on and if it is working, it should display a message telling you that there is no signal. If you see that message, you can assume the monitor is working. If you do see it, now turn on the computer and see if the message changes. If you turn the monitor on and you get no message, you can assume the problem lies with the monitor itself. If you have access to another monitor, hook that one up to test the computer output.
You can now either get the monitor fixed or the computer fixed, depending on which one is bad.
Check your connections to the PC. Make sure that they are nice and secure. If there is a resolution problem setting it should display the boot process and then go blank after starting the operating system.