I bought a NEXOC notebook on which Windows 10 should actually be preinstalled, but when you switch it on, you go straight to the BIOS and an attempt is made to boot.
I'm assuming that there's no system preinstalled, right?
You can try to exit the BIOS if that does not work there's really no operating system on it
Either, there's really no OS on it, or the boot drive is defective.
Yes I also assume that at the beginning there's always "Default boot device missing or boot failed". Since the notebook is new, nothing will be defective…
You could now use a Live Linux, for example, to read out the SMART parameters of the boot drive or to run other analyzes, but if it is a new device with a guarantee, you can simply complain.
Then just exchange the thing.