Business PCs, Workstations and Point of Sale Systems

Hi i m new here, raised with just an unknown issue with my z400 (6 dimms version).

My PC specs 

Processor : w3550

Ram : 4gb (2x2gb ECC unbuffered DIMMs)

Hard disk : 250gb Seagate

Windows 10 Pro 64-bit

This is what exactly happened, i have 2 sticks of ram installed in DIMM 1 and 3 (Black slots).

And installed a gpu amd hd 5450 on pcie x16 slot, i have 5 beeps issue with red light flashing 

I checked my both ram sticks in other z400 it work fine.

I remove gpu then check, its again 5 beeps , then i go for only 1 ram stick in DIMM 1 ,no changed happens, i i reseat rams rn different slots but non of these make any change, then i going to reset the bios by disconnect all wires and drains power of the mobo remove CMOS battery for 5 minutes and press and hold the CMOS button for 30 sec to 1 minute , but none of these work, i reseat my gpu with other pci slots but the beeps keep indicating memory issue, please help me

One thing i noticed , when i put the ram in black dimms slot (1,3,5) and press the power button the 5 beeps begin to early and when i put in white slots (2,4,6) then press power button the beeps came late.

I want to help to fix it please help me, this is my first post,