Question i just built my system and it wont output anything to the monitor

Sep 18, 2019
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Hi, i have just built a pc and it turns on but there is no signal on the monitor. I have tested the monitor with another pc and it works fine, I have also checked the power supply and it is fine too. I think it could be a cpu problem or motherboard problem. All the fans and lights turn on on the motherboard and the gpu turns on too.