Black Screen during Login

[Sir_Feather]

The game was totally fine today. But when I tried to login again, the whole screen went blank. I heard the Windows Error tone shortly after it happened. The BGM was still heard but the whole PC went stuck. So I cannot read the error messages. I have been trying to work it around; from deleting the preferences xml file, to running the game in safe mode. But still to no avail.

 

A help will be greatly appreciated!