W520 will not boot when docked; blue screen

W520 fails to boot 100% of the time when docked. Blue screen shows SYSTEM_SERVICE_EXCEPTION, STOP x0000003B for nvlddmkm.sys
nvlddmkm.sys is the NVIDIA driver, which is version 8.17.12.9620, the latest shown on the NVIDIA and Lenovo websites. BIOS is also the latest.
Systems boots fine if I remove it from the dock, but it will not boot when docked.
Windows 7 PRO SP1
2 external monitors via DVI
Any suggestions?

Boot with Option held down. After the cursor changes to an arrow, Command-. (Command Period) should open and close the optical drive. After you insert the disc, click the curved arrow to have it re-scan the discs for boot volumes. Then select the optical drive and click the straight right-pointing arrow to start.
Try it with the Apple Hardware Test disc first and run Extended Tests.

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W520 will not boot when docked; blue screen

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