点击"访问禅道"后页面出现空白状态,服务端与客户端现象一样,是什么原因导致?

前几天工作正常,今天突然出现此现象.

检查mysql服务和tomcat服务均正常,错误日志,显示如下:

[Mon Jan 06 10:39:15.765625 2014] [:error] [pid 2328:tid 432] [client 127.0.0.1:1319] ERROR: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO) in D:\\xampp\\zentao\\framework\\router.class.php on line 1551, last called by D:\\xampp\\zentao\\framework\\router.class.php on line 1513 through function connectByPDO.\n