I'm working on an HP desktop that had the onboard VGA fail. I installed a video card to repair the problem. Then I noticed that I wasn't acquiring an IP address. The IP was set to static with a different subnet on the gateway. Both were from a router, but I know this PC was working on dynamic IP previously. When I set it back to dynamic, it said it had to reboot to make the change. That surprised me, so I ran System Restore, Malwarebytes & Kasperskyto clean it out. It still didn't acquire an IP, so I ran SFC.exe, CHKDSK, & winsock repair. I installed a new NIC. I'm showing 0.0.0.0 for ipconfig & media disconnected. I disabled authentication. I'm out of ideas.