System won't boot unless remove and reinsert RAM

[lonesong2013]

PC specs:
AMD Phenom II X2 B59 unlock to Athlon II X4 559 OC 3.7GHz
Gigabyte GA-870A-USB3L
ADATA DDR3 1600 4GBx2 (before)
Kingston DDR3 1600 8GB (current)
Nvidia GT630
400W power supply(+12v 17.0A +12v2 14A)
Windows 10 Pro 64-bit
So the problem is when I start the computer,it doesn't boot and I must remove and reinsert the RAM back in then will boot.Whether I use the ADATA or Kingston,it has the same problem.
I have used this computer for 2 years and it goes wrong with that problem at few months ago.
thanks!

 

[rocktalkrock]

Perhaps your motherboard doesn't like your ram speed settings and removing them re-sets the timings to a lower default.