I was also getting the "password incorrect" error after having no previous problem. Mac still connects fine using the same password. It started last weekend after I had used a free wifi connection at a local business - no idea if that had anything to do with it. I tried at least a dozen posted fixes that worked for others without success - entering 26 digit password, preceeded by $, enclosed in quotes, reset network settings, forget network, power off and back on, etc, etc. I finally selected "other network" instead of my home network and rentered the name and password for my home network. It finally worked. I hope this helps someone else.