Hackintosh Ethernet Troubleshooting & Setup

I'm facing a complete lack of Ethernet connectivity on my Hackintosh, which is using the built-in motherboard Ethernet. I suspect that it might not be set up correctly in the BIOS, or that I might be missing some necessary kexts (driver files).

Key Requirements:
- Diagnose and fix the Ethernet connection issue
- Check BIOS settings and adjust as necessary
- Verify and install any missing kexts
- Ensure stable and functional Ethernet connection

Ideal Skills:
- Extensive knowledge of Hackintosh systems
- Proficient in BIOS configuration
- Experienced in kexts installation and troubleshooting
- Familiar with built-in motherboard Ethernet components

Please ensure you have prior experience with similar projects and can provide evidence of successful Hackintosh repairs. Thank you!