It's probably NOT the adapter. I have the exact same problem and went to check the cable + adapter at the store I bought it. Both work perfectly, but the zenbook gets no signal. Guys at the store said they've had plenty of zenbooks in for the same reason. Asus though insisted on the phone, that there's no known problem with the port. BS, there's a problem. The port is probably ok, but the drivers don't work with win7 or something. Anyway, if anyone has a solution which is something else than shipping the computer to Asus for repairing (which most likely doesn't solve the problem), I'd be glad to hear from it.