OK... so you have entered the key on your PC and it is working correct? On your Mac... when you click on the wireless icon on the top right in your menu bar, do you see your network in the list? Does it show that is connected? Just showing up in the list means that it is available, but not necessarily connected. If it is not connected, you should be able to select your network from the drop-down list and it should ask for the key. Have you gone through those steps and your key just isn't working? That's a pretty long key so just be sure it is typed correctly. Also, keys are case sensitive so you need to be sure to use capital and lower case letters the same as they appear in the key. Also, be sure that "0" (zero) and "O" (oh) are not mixed up.