Is this a crt monitor or a lcd monitor? if it is a lcd monitor then your problem is a bad back light power inverter board and needs to be replaced. if it is a crt monitor then check the brightness and contrast controls on the crt monitor.
also check to make sure that the display are compatible with the crt monitor as well! meaning that if the crt monitor's max resolution is 1024x768 and your video card is set to a higher setting then you will get a blank screen with a sometimes green power light, maybe flashing. be very careful though because may also damage the crt monitor. also check your video card setting to make sure it is at 50 hz or 60 hz some crt monitors don't like the higher vertical refresh rate.
one last thing is the age of the crt monitor, it may be on its last leg of life. when i worked at a monitor repair center a few moons ago there was a life expectancy of maybe 30,000 hours(?) on a crt(note: it's been awhile so please don't quote me on this life expectancy!)
you may get eye strain with higher than 60hz range.
One of 2 possibilities come to mind.
1, The vga chord is loose on the back of the monitor.
2, Your resolution is set too high or low to be displayed.
The blinking light means that the monitor is either not getting or understanding a signal.
Hope this helps.
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