ok so this is what I think you should do, if it wont work you should probably seek for professional help.
1) turn of your pc
2) disconnect lan cable
3) turn on pc
4) press F9 to load optimal default values for all the settings
5) press f10 to save changes and exit the SETUP UTILITY
6) if pc boots you are done, else follow the next steps:
7) set fast boot to disabled, Boot From Onboard LAN to disabled and leave anything else on default
8) press f10 again to save changes and exit the SETUP UTILITY
Good Luck