Im a first time pc builder and I just finished.When I turn it on everything runs but the monitor picks up no signal. I've tr

lowriderflow

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monitor connected to the motherboard or a video card?
if the video card, go into bios and make sure video output is not set to 'onboard'

also, mightb e silly... but make sure your monitor is on the right mode. (VGA, DVI, hdmi... whatever you're using)