This happen sometimes when the web site moving to another server that using Joomla suddenly didnt show anything at frontpage only white page and no error displayed. Kinda hard to fix thing if you dont know what to be fixed. First before doing any changes to your Joomla files try checking the connection to database in "configuration.php". Try change its permission first if you plan to change something and save those change. The default permisson for "configuration.php" is 644 anything than that your site wont be working normally.

According to the observation of security firm McAfee Labs has discovered malware that can copy itself in help file at Windows to infect computer victim. This trojan is called Muster.e by McAfee anti-virus providers, where the Trojan can infect a Windows file named imepaden.hlp that one of the help file for Microsoft IME. Imepaden.hlp file served as the main component malware storage in encrypted form. However, the help file that is already infected can still be viewed with a WinHelp browser, similar to the original help files, and users is quite difficult to find an infection which has occurred from viewing the file. Read more