Help! Error connecting to database.

Hi all,

I was messing around with file permission on my ftp server and somehow screwed up my database for “lastminutedealsireland.com”. I am just getting the message “Error connecting to database”

I tried to uninstall wordpress and reinstall it in a different folder /wordpress. I kept the previous files in the main directory as it was quite a big site. Anyways i managed to install wordpress in the other directory again and when I tried to move it I got the same error! ??

I tried to set all file permissions to 777 just to get it working but it made no difference. Any ideas? As far as I can tell the database username and password are all good.
HELP