I have Windows 7 Ultimate installed on my iMac. Ethernet connection worked just fine, but from one day to another it just stopped working. I thought it would be a drivers problem or something related to Windows. However, when I switched back to OS X, I noticed the ethernet connection wasn't working either. I have tested the cable on other computers to make sure it wasn't damaged and it worked perfectly fine. If anyone would help I would appreciate it a lot. Cheers.