So I got a computer store close to me to order in a new case for me, they got it and when they were changing components over they tested my pc beforehand and it turns out two RAM slots were faulty. They sent it to be RMA'd and I got a free upgrade (brand new) asus prime z270-k. They were putting it together and now it won't POST. I have a 6700 that was perfectly fine before this and they think it's faulty because they used a different cpu and it worked fine. Any ideas?