My motherboard is beeping 3 times

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My motherboard is beeping three times when I turn it on and I get no signal. This is my brothers build that we just put together. I heard that the cause of three beeps is a ram issue. I replaced the ram with my Corsair ram that I know works and it still beeps. What should I do? Do I have a faulty motherboard. I also tried all the ram slots
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