I have 3 Sata drives in a raid configuration and a single ssd on the sata ports. All other drives work. Suspect one drive has failed and is causing the motherboard to shut down the sata power. However in the bios the three in a raid show up but I don't recall the ssd listed. No sure how it all works but I suspect the drives can be read by the bios even without power. When it boots it takes forever and after boot the sata drives are missing. So I assume the power is down but the bios somehow knows 3 of the 4 drives are there but windows doesn't find them. As it boots up I can hear the hard drives try to spin then shut down , so I kind of think the 4th drive (ssd) is shorted and the motherboard has shut down the sata power. I guess the only thing to do is disconnect the suspected drive. If it's bad, the other 3 should start working. I heard Samsung SSD's are the best nowadays and it's a 1 tb drive. Funny how an ssd can fail when it it's been a read only drive for years. Am I on the right track? I can't think of anything else.