Question Computer working but nothing shows

Dec 25, 2019
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Hi, first time huilding a pc, and everything seems to be going well when i pressed the power button. All the fans are running and the rgb lights come on. However, even when i put the hdmi cord to the monitor, the monitor doesnt pick any signal. I know the slots in the motherboard works because I can charge my phone. I really am hopeless with no experience any help is very appreciated.