Computer could be new, but not GPU inside it
All thx to NoVidya stupid proprietary drivers.
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Remove all you nvidia drivers
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Try driver in AUR https://aur.archlinux.org/packages?O=0&SeB=nd&K=nvidia-390&outdated=&SB=p&SO=d&PP=50&submit=Go perhaps it works now and will somehow magically keep getting maintained by some superhero
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If no luck there - try Nouveau driver, it should be enough to do basic stuff, but not optimal for gaming and i assume CUDA won’t work, but not sure…