I just got thru building a new computer and upon starting for the first time, I got the stop error 7B inaccessible boot device. On the POST i see that that one of the drives is not being recognized as there. Upon changing the ribbon cables I find that all of then will show up just not at the same time. So I am wondering what is wrong as this is the first time in about 30 builds that I have encountered this problem. Any insight as to what is going on and jow to rectify the problem would be greatly appreciated. Thanks