My computer was working fine until just recently the monitor says "No Signal." I checked to see if the connections were right and nothing was wrong. Does anyone know what I can so?

My computer was working fine until just recently the monitor says "No Signal." I checked to see if the connections were right and nothing was wrong. Does anyone know what I can so?

seen this so many times ,unboard video and a install video card ,with the monitor plugged into the wrong one ,this may be wahats happing to you ,do you have another blue connection like the one you monitor is pluggged into

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