Mac Book Pro freezes on start up

Ever since upgrading to Lion OS X from Snow Leopard my Mac Book Pro freezes on start up. When the login box appears the “waiting wheel” comes up and the whole machine is frozen. The only thing to do is hold down the pose button and restart.

Looking at the Apple support site this seems a common issue. I have a iMac 27″ which also has the Lion upgrade on it with no issues.

Some suggestions lead to Adobe Flash player and disk permissions. Neither of these has solved the issue for me, some say it does but I have had no resolution to the issue.

The only thing so far that is working is to enter the password immediately when the box appears.

Lets hope Apple fix this soon…