Did you connect your PSU to the GPU? What PSU are you using?
Those beeps usually mean either bad system memory or a bad video card. As you mentioned that the system works fine with your old GPU, it sounds like your RX 480 is faulty.
Yes gpu is connected with psu. AURUM CM 650 (AU-650M)
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Make sure you have latest board bios: "A88XM-PLUS BIOS 2903"
With other GPU open bios and change to boot in BIOS not UEFI and see if it boots...