My pc didn't post at all so I tried re installing the ram. It booted just fine the 1st time after that. 2nd 3rd or 4th, did no longer work. I tried the same thing with the ram and the result was the same: One successful boot. What should I do to fix this problem?
Problem solved. The problem had nothing to do with the ram. (I find it really weird that moving it around did something).
The problem was: While playing around in Intel extreme tuning utility, I had accidentally set the cache frequency higher than the core frequency. I changed that back to normal and I've now had 3 successful boots in a row. Thanks for your help anyway :)
By the way I used anti static wrist band when I touched the ram sticks.