Computer says no boot device found

Computer says no boot device found

im having a similar problem with my hp stream 11. the internal operating system was erased. now when i turn it on it says no boot device, i made the usb installer as suggested but when i plug it into my labtops usb still says not bootable disk enter bootable disk and press any key. i changed the bios setting followed the YouTube videos close as possible please what am i doing wrong cause rt now its and expensive paper weight.