What Causes a Computer Monitor to Go Blank?
While a blank screen may be caused by a general power outage, more often it’s a problem with the screen itself. It could be a loose video or power cable going to the monitor. If that’s the case, you can get the screen working again and be back in business in a few minutes. Power Problems All the power might be off due to a bad outlet, switch, fuse, or circuit breaker. If you hear no sound coming from the computer and its power light is off, check the power connection and breaker or fuse. Video Cable Many times the cause of monitor blackouts is a loose video cable connection. This might happen if you move the monitor or the cable. The video cable runs from the back of the computer to the monitor. It has a multi-pin connector on each end and both of them screw down securely. If the screws aren’t tight, either connector could become loose. If that happens, the video signal could stop suddenly and make the picture go blank. Check both ends of the connector to make sure they’re firmly seate
