Try the following actions to try and resolve the issue, or at least, to determine what could be reason for it:
- Check the Boot order in the BIOS and make sure the SSD 335 is set as primary boot drive.
- Review the information reported by the drive in the BIOS and make sure it is being detected properly.
- Boot from a different hard disk or Operating System, using the SSD as a secondary drive. Check if the OS detects it and if you are able to see the data on it.
- Try accessing the drive in a different computer.