Without the model number, it is not possible to research this issue. However... My first suspect would be with the software driver. Some system settings do not like to be oscillated too quickly. (I.E.Going in and out of sleep mode for the computer too quickly, or to and from power save for the monitor too rapidly.) This was a problem especially for older versions of windows. (Vista and prior.) Increase power-save to more than 5-10 mins, and check for driver updates. Being that you were able to get it running without unplugging or turning off the monitor, I do not believe it is a monitor issue. (Outside of the RARE possibility of a hardware or firmware conflict between the monitor and video card/chip set.)
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