Can you provide more details? What didn't work about the ethernet connection? It was a known, good connection prior to this, correct? Is your ethernet controller disabled in either your BIOS, or Windows? Cable disconnected? I've seen RJ45 plugs where the retention clip was partially broken and allowed the cable to move just enough to stop making contact, while still looking like it was plugged in. Showing that it's connected, but not obtaining an IP? There's too many variables, we need to know what's happening.
What wasn't working about the wireless adapter?