The points to hardware failure - most Lenovo business products comes with 3y onsite NBD repair.
I have a P330 gen2 - with Intel 630 - it just works using Manjaro.
Did you test the ports with different cables?
For the past decade I have been using Lenovo hardware for it’s stability, compatibility and supreme warranty program.
Lenovo usually comes with Windows so disabling secure boot is mandatory.
I my experience Lenovo works OOB with Manjaro - any Linux actually - so you can verify using e.g. Ubuntu or Fedora.