Sorry to dig this thread up, but I'm having this exact same problem.
I'm hoping someone could help me with understanding which connection files to delete in order to try and get this working.
I've been installing and uninstalling and reinstalling .......for 6 days now and would love to get this thing working again.
Oddly enough, my symptoms were very similar. One day it was working. The next day it wasn't. I'm using Dreamweaver & Apache and can get into MySQL just fine outside of Dreamweaver.
Thank you in advance for any help you can provide.