Re: NVIDIA 8400M G installation fails
[ 257.644701] NVRM: This PCI I/O region assigned to your NVIDIA device is invalid:
[ 257.644703] NVRM: BAR1 is 0M @ 0x00000000 (PCI:0001:00.0)
[ 257.644709] NVRM: The system BIOS may have misconfigured your graphics card.
[ 257.647107] nvidia: probe of 0000:01:00.0 failed with error -1
[ 257.647822] NVRM: The NVIDIA probe routine failed for 1 device(s).
[ 257.647826] NVRM: None of the NVIDIA graphics adapters were initialized!
First of all I'd try with the newest available driver to see it works as expected.
If that doesnt work, I'd try changing some BIOS settings, and as a last resort I'd check for a BIOS update.