Computer beeps 50 times and reboots

I just built a new computer with a Gigabyte motherboard and an Intel i5 1150 processor worked fine for about 4 days now beeps repeatedly about 50 times and then reboots and repeats the process. Never passes POST so I can't use any diagnostic software. I've tried removing the PCIe cards and doesn't resolve issue.
 
How many memory sticks are installed? Did you put thermal paste between the CPU and its heat-sink?
 
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