Boot screen has garbled messaged after Win2000 SP4 installation

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Problem:

After installing SP4 on Windows 2000 system, during boot where previously was listed 'hit esc to cancel loading siwvid' etc... is now a colored block or garbled message.

Resolution:

With Win2k SP4 there were changes to the VGA code that are leaving some VGA controllers in an odd state. This is what is causing the garbled screen that you are seeing.

To work around it you will need to do the following:

(1) Using Regedit (insert all the usual warning that come along with using regedit here) go to HKLM\System\CurrentControlSet\Services\Siwvid and change its Group to be 'Boot Bus Extender' without the quotes.

(2) Make note of its tag value, it should be 0x10.

(3) Go to the following registry key, HKLM\System\CurrentControlSet\Control\GroupOrderList.

(4) Double click on boot bus extender. Increase the first byte by one. After entering in the 1 value you will most likely need to hit the delete key depending on which registry editor you are using.

(5) Type in the dword of the Siwvid tag. Should be hex ten. You would enter this as (assuming byte display is showing) 00 00 00 10

(6) Make sure /noguiboot is in your boot.ini file for the os that is being debugged

(7) Reboot.

Old KB# 11607
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