P965 motherboard ethernet jack...just stopped working?

So I was just sitting here, watching a movie on my computer. Heard a loud pop, but we were having a lightning storm so I figured it was a tree branch falling outside or something. A few minutes later, I realize my internet connection is down. I've actually narrowed it down to my computer, now, and I'm wondering if my onboard LAN is shot somehow (other computers using the same connection, such as the one I"m using right now, are fine). The two LED lights on the ethernet jack are flickering on and off, simultaneously. Every time they're off, I get the message "A network cable is unplugged." Then when they're back on, that message disappears and I get the "connected" icon in my taskbar. But it switches back to "disconnected" every second or so.

Is there any way to diagnose whether my ethernet jack is now kaput? It didn't "look" any different when I looked at the board just now.

Could be your router that popped. Try a different jack. Also, examine the cord for scorch marks, and also check your motherboard capacitors around the ethernet jack.