主机商换了IP后解析完新IP就出现这种情况

Discuz! Database Error
The database has encountered a problem. Need Help?
Error messages:
[Type] 无法连接到数据库服务器
[1045] Access denied for user 'XXX'@'localhost' (using password: YES)

Program messages:
[Line: 0051]forum.php(discuz_core->init)
[Line: 0065]source/class/class_core.php(discuz_core->_init_db)
[Line: 0364]source/class/class_core.php(db_mysql->connect)
[Line: 0764]source/class/class_core.php(db_mysql->_dbconnect)

已经这样好几个小时了，现在我是该等主机商帮我解决，还是自己解决？主机商给了我密码，我自己可以进入PHPMYADMIN后台。如果要自己解决的话，具体怎么办？求帮忙