New computer can only get video out for a few seconds in bios

Just built my first pc, i get the one beep on bootup-everything seems fine- but i have hdmi going through the gpu to the monitor and i can see the motherboard screen come up and says press del to go into bios but after 5 or so seconds the video output disappears.. What could be causing this?
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  1. This topic has been moved from the section Opinions and Experiences to section Systems by Buwish
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