It's telling you that someone has opened the computer case (or it thinks they have).
So check it's all screwed up properly first.
From memory you can usually turn off detection in the BIOS which means hitting a key sequence during boot to get into it then finding the setting and disabling it.
Do the visual check first then come back with the make/model of your computer and someone will help you get into the BIOS.
It's unlikely to be terminal.
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