Try clearing the settings by pulling the CMOS battery and leave it out of the system for 15 minutes, then reinstall and try to boot again. If that does not help try reseating the drive. If you are still not able to boot from the drive then it is possible the drive has failed. Run diagnostics, F12 at boot, to confirm drive problems. If the system is still under warranty call Dell tech support for assistance.
Am facing an issue 3 Dell OptiPlex 7090 mini tower , all the 3 are having issue with M.2 nvm 2280SSD (TwinMOS 512 Gb) failed not getting detected and  not able to boot from it. I run diagnostic Error Fail ED.2.4.8 Error 2000:0141 validate code 113736No Hard Drive detected .  
OptiPlex 7090 NVMe Failing