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#11
Try changing the SATA port.
I changed my SATA cable for the motherboard ones. Now my SSD is not showing up in the BIOS when in AHCI mode. It does show up in IDE mode though.
If it is a normal HDD, we could use manufacturer's diagnostic tools to test and verify whether the disk is in good shape. Unfortunately there is no such tools exist for solid state drives. Although some manufacturer's released supporting software for their SSD, they are only helpful in updating firmware etc.
Do you have any chance to test that SSD on another system ?.