System booted after moving RAM

[heath1]

A few days ago, I turned on my computer and it hung on the ASRock BIOS splash screen. I waited about 10 minutes and then attempted to go into boot options and other options, all of them unresponsive. I force turned off my PC and tried again 2 more times, same thing. I turned it off again, removed one module and it booted. Replaced that module with the other and it didn't boot, so I thought that module was bad. Then I decided to place both in slots 2/4 instead of the original 1/3 and it's been booting fine ever since. I've had my PC about 3 years. Any guesses on why it did this? Could it just be suffering ram slots on my mobo. Thanks!

Fx 6300
R9 270X 11217-01-20G
CX600M
Corsair 230T
Crucial Ballistix (4x2) 8 GB 1600MHz
Asrock 970 Extreme3 R2.0

 

[CPU2016]

You should look in the instruction manual for the motherboard, RAM is supposed to be placed in different slots based on how many sticks you have.