'Access denied for user 'root'@'localhost' (using password: YES)' was my original message when I tried starting up Mamp. This seems to be an ongoing dilemma going back years. I was readying a move to a live site changing password from "root" when I got this message. After many re-installs (saving old version) A try at Mamp Pro, etc. In desperation, banging around trying stuff I shouldn't I had no luck. Changed back to "root" password got MAMP/Mysql up and going but could no longer open my WP blog. I was locked out. I've actually been able to track down the root cause. I inadvertently lost/destroyed this in Phpadmin - PRIVlLEGES - User overview -- The bottom line; (User) root - (host) localhost - (password)Yes - (Global privileges) ALL PRIVILEGES - (Grant) Yes - It's gone. Or turned off. I'm locked out of my blog!!! I found this info going through MySql Planet/Oracle manuals. No solution was offered. (Ha, ha, ha, ...I believe I'm going madddd!) It seems simple and it probably is but I need to find out how to rectify this. I've been working on this blog for six months.