The computer will only boot when none of the drives are connected. When we connect any of them one-on-one, it won’t. I wouldn’t think that 3 drives would all break at the same time, so perhaps it is the PSI card? Two of the drives are Avid Quiet Drives and the other is a Medea drive. When we turn the Avid drives on, they yellow and green light are on, but the yellow one never turns off. Is this a sign that the drive is bad? Thanks.