Are you receiving any error messages? If so, what error messages are you receiving? Is the drive detected by the computer's BIOS/EFI at all? Does it show up in disk management or disk utility? Are you able to create or delete partitions on the drive? Can you access the drive as a secondary, non-booting, non-raid drive? Can you copy files to or from the drive after creating a new partition on the drive using disk management or disk utility and then full formatting the partition? Normally it is not advisable to full format an SSD, but as a test its a very reliable way to test if the drive is working properly. Can the drive be accessed when attached through a different SATA cable to a different SATA port? There are status indicator lights on the drive. These status indicator lights will provide more information about what the drive is doing. What color lights are lit up when the problem occurs?