| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_win-guest-bluescreen">
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| 4 | <title>Windows Bluescreens After Changing VM Configuration</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Changing certain virtual machine settings can cause Windows
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| 9 | guests to fail during start up with a bluescreen. This may
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| 10 | happen if you change VM settings after installing Windows, or if
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| 11 | you copy a disk image with an already installed Windows to a
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| 12 | newly created VM which has settings that differ from the
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| 13 | original machine.
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| 14 | </p>
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| 15 | <p>
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| 16 | This applies in particular to the following settings:
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| 17 | </p>
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| 18 | <ul>
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| 19 | <li>
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| 20 | <p>
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| 21 | The ACPI and I/O APIC settings should never be changed after
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| 22 | installing Windows. Depending on the presence of these
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| 23 | hardware features, the Windows installation program chooses
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| 24 | special kernel and device driver versions and will fail to
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| 25 | startup should these hardware features be removed. Enabling
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| 26 | them for a Windows VM which was installed without them does
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| 27 | not cause any harm. However, Windows will not use these
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| 28 | features in this case.
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| 29 | </p>
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| 30 | </li>
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| 31 | <li>
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| 32 | <p>
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| 33 | Changing the storage controller hardware will cause bootup
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| 34 | failures as well. This might also apply to you if you copy a
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| 35 | disk image from an older version of Oracle VM VirtualBox to a new
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| 36 | virtual machine. The default subtype of IDE controller
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| 37 | hardware used by Oracle VM VirtualBox is PIIX4. Make sure that the
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| 38 | storage controller settings are identical.
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| 39 | </p>
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| 40 | </li>
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| 41 | </ul>
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| 42 | </body>
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| 43 |
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| 44 | </topic>
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