What do i do if my computer says boot device not found

I turned on my computer and all it does is pop up a screen says boot up device not found please install operation system what do I do to fix it

may i have some more information about the product you have? check if there is some external device connected, and check for HDD self test in BIOS. if test passes without any error and there is no external device or disc on ODD. you may need to re-install OS.
Regards,
WW
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