In the bios there are two options for when you are selecting a boot drive. When tyou first click on the boot tab where the boot sequence is , it is listed at the top of the list just under that there is another line that has a list of hard drives and the ssd has to be selected as the first hdd there also.
Did you enable AHCI before you loaded the OS?
In case you haven't you may have to upgrade the firmware on the SSD because it does have issues with the Marvell controller. The firmware update can be done with the OS loaded and it will not affect it.
So in the boot tab in the bios the SSD has to be listed first twice and there are known issues with the marvell controller which is the controller for the sata 3 ports.