I found there was an error on SAPDL580 server, the message from event log display "An error occurred while the wizard was checking the current Windows product license. Error Code: 8: 0x8007007f".

When I tried to login the server four times this morning, it refused me login and hung black screen, I had to hard boot the server.

And I checked the Microsoft help, it seams that the error was caused by install the windows SP2 with RDP by you last night. Some suggestion said it should be right after reboot, other said it should be uninstall the SP2.[@more@]