I purchased the holder and screws from Dell for a SSD. On another machine, I cloned the original M.2 256gb to a Samsung 840 500gb SSD (which I've been using for 2 years in an older Latitude). I installed the SSD. It worked perfectly. The laptop sat for 2 weeks turned off. When I tried to turn it on, it was dead. I put the M.2 back in. Still dead. Dell replaced the MB. Everything was OK. I put the SSD back. It was OK. It sat for a few days and then died. I put the M.2 back in and sent it to Dell. Dell replaced the MB again. I want to use the 500gb SSD. Is there some reason that I can't? Do I have a shaky power supply? Thanks.