My Macbook Pro keeps coming up with "accountsd wants to use the login keychain"\

I can't access anything on my screen but the request to enter the keychain password. None of my passwords work.

I tried several things, from deleting entries in keychain (which only made things worse) to several other things I saw.

The only thing that really worked was to reinstall OS from scratch, I mean, erase your disk and reinstall.

When the system is back, use the very same password you have for iCloud for everything in your Mac.

It is not ideal, I know, but that is an approach.

I think this worked (after I was careful to type in a "case-sensitive" manner) on my MacBook Pro running Sierra - 10.12. We'll see if the solution lasts the rest of the day.

It worked for a few hours, but the problem reoccured ... 😟

You might want to consider starting a new discussion. Since this one is a couple of years old, less people are likely to look at it. A new post would be much more visible. You can link to this one.