OS - 使用者登入對話框是黑的怎麼辦?

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SYMPTOMS
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After you press CTRL+ALT+DELETE to log on to a Microsoft Windows Server 2003-based computer, the logon screen turns black. Although you cannot see what you are typing, you can successfully log on to the Windows Server 2003-based computer. Then, after you successfully log on, the screen becomes visible.

Note This symptom may occur on both the terminal server sessions and the local console. Additionally, this symptom occurs even if you start the computer in Safe mode.

CAUSE
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This issue occurs if all the values under the following registry subkey are set to "0 0 0":
HKEY_USERS\.Default\Control Panel\Colors
Note The value data "0 0 0" means black.

WORKAROUND
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To work around this issue, perform the following procedures.

Export the registry subkey from another Windows Server 2003-based computer
1.  Click Start, point to Run, type regedit in the Open box, and then click OK. 
2.  Locate the following registry subkey:
HKEY_USERS\.Default\Control Panel\Colors 
3.  Right-click the Colors registry subkey, and then click Export. 
4.  In the File name box, type a name for the file. 
5.  Note the location where you will save the file, and then click Save. 

Import the registry subkey into the affected computer
1.  Click Start, point to Run, type regedit in the Open box, and then click OK. 
2.  On the File menu, click Import. 
3.  Double-click the .reg file that you want to import. 
4.  Quit Registry Editor, and then restart the computer. 

REFERENCE
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906510 The logon screen turns black after you press CTRL+ALT+DELETE to log on to a Microsoft Windows Server 2003-based computer https://support.microsoft.com/kb/906510