Short Continous beeps after changing RAM

Aug 15, 2018
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MOBO - Gigabyte GA-H61M-DS2H
Old RAM - DDR3-1333 CL9 udimm (2x4gb)
New RAM DDR3 PC3 10600 1333MHz 240 ECC (2x 8gb)

So I've decided to switch my 2x4gb RAM in to 2x 8gb. But when I switch, MOBO starts to countinously beep (in short beeps) and then restarts again and again (Black screen too). Motherboard's max capacity is 16gb of RAM. Any Ideas how to fix it? Thanks