GIGABYTE GA-Z68X-UD3H-B3 - Memory Issue

I recently bought parts for a new computer. After installing them the computer would cycle on/off in a loop, never reaching the POST screen, unless I pulled the power / held the power switch for a bit. I have narrowed it down to a problem with the memory sockets. When I have memory in DDR3_1 and/or DDR3_3 (farthest from the CPU) I make it to the POST screen, however if I put the memory in DDR3_2 or DDR3_4 (closest to the CPU), the problem reoccurs. Is the board defective or is this something I can solve in the bios? It does not seem linked to the specific memory cards as all 4 work in the DDR3_1/DDR3_3 socket.

I checked online and the memory is listed as being support for the board, I also tried increasing the voltage to 1.65 V as listed on the memory info as it was defaulting to 1.5 but that made no difference.

Parts List:
CPU: Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor
MOBO: GIGABYTE GA-Z68X-UD3H-B3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard
VID: EVGA 01G-P3-1556-KR GeForce GTX 550 Ti (Fermi) FPB 1GB 192-bit GDDR5 PCI Express 2.0 x16
PSU: CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92
HDD: Western Digital Caviar Blue WD5000AAKX 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5"
Memory (x2): ADATA XPG Gaming Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model AX3U1600GB2G9-2G
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