I am having a problem with a few computer cases. When building a computer I put the motherboard together with the processor, fan and cards and check the BIOS before putting it in the case. I have a couple of cases that will not accept any board used. The board works when out of the case, but not in the case. I can take the board out and it works again. I had a co-worker who talked about a case becoming ?magnetized?, is this a real issue or am I getting hoaxed? If it is a real issue, how can I correct the problem?