This message was posted on behalf of Intel Corporation
As per our translator application, we understand that your Intel® SSD 750 Series suddenly stopped being recognized in the BIOS.
We can recommend testing the SSD in another PCIe* port, or in another system. Additionally, you may need to make sure your using the latest BIOS and Chipset Driver versions for your motherboard.
If after this the drive is still not recognized, as Yanqiang suggested, the best thing to do will be to contact our support team.
Note: While our world wide support community is in English, you may also post directly to our Chinese Support Community.