Dear All,

today I was working with my Dell Optiplex 9030 AIO and it freezed.

When rebooting, it says no boot device found.
I found some posts here suggesting to enter F12  and in boot list option select UEFI but didn't work (same problem).

Another thread suggests to manually add a boot option, but when I try to it alerts File System not found.

Diagnostics shows everything is ok,
anyone can help me please?! 

Thanks a lot