One User account will not open. Others are OK. Advice please

[SheerGold]

There are a number of user accounts on my computer.

All of them work, apart from one.

When I try to log into that User Account it will not open. I am using the correct password .

I can see the contents of that account when I am logged into one of the other accounts.

Is there any simple way of getting the User account working properly again?

I have backups of the Users folder. I could just replace the User that I cannot log into with that User from one of the backups. But the information will be slightly different as the backups were done weeks ago. Also I don't want to use those backups as I have had problems doing similar things before (because the system seems to remember where the files came from and that causes clashes).

I am running OS 10.5.5

 

[CashGap]

What happens when you attempt to login?

Are any log entries created, or any console messages?

 

[SheerGold]

What happens when you attempt to login?

Are any log entries created, or any console messages?

When I try to login I just get a blank screen. It has nothing on it except the normal background.
It stays like that permanently.
Eventually I have to press the restart button.

I am really confused by all the logs. Where do I find them & which ones are relevant?