Good Afternoon Colleagues

I hope you are doing good and safe. I have OptiPlex 3070 Tower . It comes with Ubuntu installed on it. I need to install windows 10 . Kindly find the below :

• I created USB flash with windows 10 installed then Insert USB flash to USB interface then  boot windows 10.
• I deleted all partitions then create two new partitions and install windows 10 on the first partition .
• Once windows 10 restarted , i removed USB flash so i can boot to windows 10.
• What happened that i received a message "No bootable devices found" . When i log to bios , I can't find the internal harddisk as one of the boot device option. It has been disappeared although i can see hard disk in bios summary page.

So kindly advice.

Best Regards