I have finally been able to test all the sticks, of course it was the last one. I must admit i didnīt do the most extensive testing due to lack of time. All the same error messages came up when i did the last stick as when i did with all sticks and i havent found anything wrong with the others.
Is there any point in testing all the motherboard slots when ive found a faulty stick?
Guess ill have to take it to the store to see how easy it will be to get a refund.
Thanks for all the help!