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Connect the monitor to some other computer, e.g., a notebook, and see if it does the same thing. If it does, then the monitor is the problem.
If it does not, then your computer is not putting-out any "video" signal, and so the monitor goes to "sleep".
If you have MORE than one VGA-output port on your computer, connect your monitor to the "other" VGA port.
Or, press-and-hold the ON/OFF button on your computer, to force it to completely shutdown.
In windows click start, control panel, power options. On the first page"when the computer is plugged in" turn monitor off NEVER on the hibernate tab uncheck enable hibernation if checked, also disable sleep mode
U need to check that the power supply and power switch is working. If everything is working properly, suspect no video output send to monitor resulting the monitor is in sleep mode. U can try switch to integrated display of clear CMOS.