Server board S2600CP2 1-5-1-2 beep code

I just bought brand new Intel server board S2600CP2, installed with 128 (16*8G DDR4-1600) RAM, 2 X E5-2620 processor, attached all power cable (server board, 2 CPUs), with 1000W PSU,  but when I try to first time power on the server, i receive 1-5-1-2 beep code, the system can't start, nothing showing on screen (actually no signal output).

I checked manual, 1-5-1-2 beep code means: VR Watchdog Timer sensor assertion.

Anyone has any idea?

Maybe I should go MicroCenter exchange one but they only has one left.

Thanks,