Here is as per your mobo manual,
1. If 3 long beeps are heard, remove all memory modules and try to install only one memory module in the DIMMA2 slot first and then restart the computer.
2. If 1 long 2 short beeps are heard, remove and reinstall the graphics card and then restart the computer. Test with another known working graphics card.
The ram y r using is in the QVL list? If so then if you have activated any xmp profile or not?