Strange pc stuff

[Null3]

Hello! 

 

As i finished my build, i powered it on and it had some issues, that i managed to fix but now it is showing me "An operating system wasn't found" how do i fix it? 

I powered it on 1 time and it went good and even had all my files, now i seem to not be able to boot into windows... 

[AKS_Adrian]

You probably need to change your boot order in the BIOS, it might be trying to boot to any secondary storage drive you have instead of the OS drive. Make sure to unplug any external storage devices, such as USB drives, SD cards etc, too.