black screen when booting up pc

Sep 5, 2018
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I have a Gigabyte GA-AB350M-DS3H and DeepCool TX Mid Tower TESSERACT SW when I turn on the pc for 10 mins the monitor says no signal.also, there is a short beep when turned on. not sure if this helps, but the motherboard lights are on but one strip is a bit dimmer than the other strips.